which type of ore deposit originated before there was free oxygen in the atmosphere?
The type of ore deposit that originated before there was free oxygen in the atmosphere is known as a Banded Iron Formation (BIF).
BIFs are sedimentary rocks that consist of alternating layers of iron-rich minerals (predominantly hematite or magnetite) and silica-rich minerals (such as chert or jasper).
BIFs formed during the Precambrian era, specifically in the Archean and Proterozoic eons, which occurred prior to the development of significant levels of free oxygen in the Earth's atmosphere. These deposits formed in ancient oceanic environments where iron and silica were present in high concentrations.
The formation of BIFs involved the interaction of iron-rich fluids with seawater, leading to the precipitation and accumulation of iron minerals in layers. The iron minerals were derived from hydrothermal activity, volcanic eruptions, and weathering of iron-rich rocks on the Earth's surface. The oxygen required for the formation of the iron minerals was derived from various sources, including photosynthetic bacteria that produced small amounts of oxygen through photosynthesis.
The deposition of iron-rich sediments in BIFs ceased once significant amounts of free oxygen were introduced into the atmosphere through the oxygenation of the Earth's oceans and the evolution of oxygenic photosynthesis by cyanobacteria.
This oxygenation process led to the oxidation of the dissolved iron in the oceans, resulting in the precipitation of large amounts of iron oxide minerals that settled as sedimentary deposits, forming BIFs.
BIFs are important sources of iron ore, and their ancient origins provide valuable insights into the Earth's geological history and the evolution of its atmosphere and life forms.
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which two U.S. states have the largest petroleum reserves?
1. Earthquakes result from the movement of materials within Earth's
O asthenosphere
O lithosphere
O inner core
O outer core
How many degrees of longitude is the earth divided?.
Answer:
180 degrees for its eastern part and the same for the western one
what does all of this imply about how stars form from molecular clouds?
The process of star formation from molecular clouds is a complex and ongoing process that occurs over millions of years.
Molecular clouds are massive structures of gas and dust that are found throughout the universe. These clouds are the birthplaces of stars and planets, and they are formed when clouds of gas and dust in space collide and merge.
The distance to the nearest star is an indication of the size of the molecular clouds from which stars form. Molecular clouds are typically very large, with diameters that can be hundreds of light-years across. This means that the nearest star is likely to be located in a very large molecular cloud.
The size of molecular clouds is an important factor in the process of star formation. Molecular clouds are too diffuse to allow stars to form directly from within them. Instead, the gas and dust in the clouds collapse under their own gravity, forming a dense core called a "stellar nursery."
The collapse of a stellar nursery can lead to the formation of a protostar, which is a young star that is still in the process of accumulating mass. As the protostar continues to collapse, it heats up and begins to shine, eventually becoming a fully-formed star.
The process of star formation from molecular clouds is an ongoing process that occurs over millions of years. As new stars are formed, they can help to shape the molecular clouds in which they formed, and they can also affect the formation of other stars and planets.
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Name 2 oceans where the upwelling takes place with the thermohaline circulation?
Answer:
The thermohaline circulation is mainly driven by the formation of deep water masses in the North Atlantic and the Southern Ocean caused by differences in temperature and salinity of the water.
Explanation:
The primary source of energy that drives convection within the atmosphere and oceans is
A. the force of gravity from the moon.
B. thermal energy from the sun.
C. Earth's magnetic field.
D. Earth's gravity.
Match the item in column 1 with its description or consequences in column 2.
Trade
Ocean highways
Rural areas and
cities
Landmasses
?
?
?
?
Links culture regardless of
distance
Opened up the world to
trade
Often very different in
culture
Barriers to worldwide
trade
The correct match for the following description is
Trade: Links culture regardless of distance
Ocean highways: Opened up the world to trade
Rural areas and cities: Often very different in culture
Landmasses: Barriers to worldwide trade
What is Trade?Trade, which is typically done in exchange for money, is the transfer of goods and services from one person or institution to another. Economists refer to a system or network that allows trading as a market. A system or network that permits trading is referred to as a market by economists. The direct exchange of products and services for other goods and services, or trading without the use of money, was a first form of trade known as barter.
What is Ocean Highway?Early in the 20th century, the term "Ocean Highway" was coined to describe a network of roads and waterways for motor vehicles that would typically travel as closely as possible to the Atlantic Ocean along the East Coast of the United States, from Jacksonville, Florida, to North Brunswick, New Jersey.
What are rural areas and cities?The rural area or countryside is the region found outside of towns and cities. Small communities and low population densities are features of typical rural settings. Rural regions are frequently those that are agricultural or have a forest cover.
What are Landmasses?A large area of land is referred to as a landmass or a land mass. The phrase is frequently used to describe areas of land enclosed by water, such as a continent or sizable island. A landmass is an identified portion of the continental crust that rises above sea level in the science of geology.
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During a thunderstorm, a plasma channel forms between the negatively charged clouds and the positively charged earth, which creates lightning. when lightning is observed, what has passed through the plasma channel? atoms electrons nitrogen water
Electrons.
An electrical discharge is lightning. The air around lightning may reach 30,000°C (54,000°F) in only one lightning strike! As a result of this intense heating, the air rapidly expands explosively. The expansion generates a shock wave, which develops into the thunderous sound wave.
High in a thunderstorm, ice crystals collide as they drift up and down in the tumultuous air.
As they collide with one another, ice crystals are knocked off and added to by tiny, negatively charged particles known as electrons. This divides the cloud's positive (+) and negative (-) charges. The base of the cloud becomes negatively charged, while the top of the cloud becomes positively charged with protons.
Positive charge is carried into the cloud by a powerful electric current that forms at the point where the stepped leader and positive charge collide. The return stroke is the name given to this electric current.
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why do the north pacific and north atlantic gyres rotate clockwise?
The rotation of the Earth causes a change in the path of the direction. As a result of which the North Pacific and the North Atlantic Gyres rotate clockwise. While the change in the direction takes place to the heavy gushing of the winds, this is actually due to the nature of the Coriolis effect.
What is a Coriolis Effect?
The Coriolis Effect actually is terminology in Physics whereby the objects that are in motion in a continuous streak and an external force causes the change of the object from its normal path is known as the Coriolis Effect.
The Coriolis Effect is actually the external blowing of the wind while the earth's rotation affects the weather. The storms due to the Coriolis Effect always blow or swirls clockwise in the Southern Hemisphere, whereas in the Northern Hemisphere it blows counterclockwise.
The Coriolis Effects terminology can be termed as something more of Coriolis Force. Hence my above statement is proven.
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What type of economy is based on supplying the goods and services that people demand?
A traditional
В. command
C. market
D. mixed
Answer: market
Explanation:A market economy, also known as a free market or free enterprise, is a system in which economic decisions, such as the prices of goods and services, are determined by supply and demand
what is the most abundant mineral or mineral group in earth's crust? what is the most abundant mineral or mineral group in earth's crust? feldspars olivine hematite quartz calcite
The most abundant mineral group in the Earth’s crust is the feldspars. Feldspars are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental .
They are also found in various types of igneous, metamorphic, and sedimentary rocks. Feldspars have two main subgroups, alkali feldspars, and plagioclase feldspars. Alkali feldspars include orthoclase, microcline, and sanidine, while plagioclase feldspars include albite, anorthite, and labradorite.Feldspars are important minerals in the production of ceramics and glass. They are also commonly used as a raw material in the construction industry for making concrete, roads, and buildings. Feldspars are found all over the world and are commonly used in the pottery industry.
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Which of the following is a main reason why vast parts of the African continent are virtually uninhabited?
A.
low birth rates
B.
unstable government
C.
poor soil quality
D.
huge wildlife reserves
Answer:
B
Explanation:
because most of the African governments are irresponsible and cant well manage their countries even if they are trying their level best.
A shadow is formed by ...... bodies
Answer:
A shadow is formed by opaque bodies.
Explanation:
What is a shadow?
A shadow is a dark, two-dimensional shape formed on a nearby surface when an opaque body is placed in the path of light emitted by a source.
What are opaque bodies?
Objects that do not allow light rays to pass through them are known as opaque bodies. In other words, opaque bodies obstruct the path of incident light rays.
Why is a shadow formed?
A shadow is a dark two - dimensional cast of an opaque object placed in the path of light, on a nearby surface. Since the body obstructs the passage of light rays following that path and either deflects or absorbs them, so no light ray reaches the surface in the region covered by the projection of the body on that surface.
Hence the area appears dark and assumes a shape exactly identical to the shape of the opaque body.
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The fossil record helps scientists identify a single species from which other organisms have descended. Which is used to refer to this single species?
Common ancestor
Which statement best describes the fossil record?
It's an incomplete record
Which statement accurately describes a half-life?
A half life is the time required for half of a radioactive element to decay
This fossil shows tunnels left after animals burrowed through the sediment. Which statement best describes this fossil?
It is a trace, because it shows evidence of animal activity
Which phrase describes faults?
Cause rocks to break and move
What determines the length of a geologic time period?
Fossil record
Which best explains how scientists confirmed that the moon formed around the same time as Earth?
Scientists used radioactive dating to study the age of material from the moon and earth
Compared to absolute dating, what is the advantage of relative dating?
Age, in years, cannot be determined for an individual fossil.
Which important event in Earths history occurred during the Jurassic period?
The first birds emerged to Earth
Which period belongs to the Paleozoic era and not the Cenozoic era?
Devonian
The diagram illustrates radioactive decay. Which statement correctly identifies structures 1 and 2 in the diagram?
Structure 1 is an unstable atom that turns into structure 2, a new atom
Which statement describes potassium-argon dating?
Potassium-40 decays into argon gas over time
Which event most likely if an index fossil is found in a layer at location 1, but the layer and index fossil are not found at location 2 nearly, which is known to be the same relative age?
The organism did not exist at location 2
Which characteristic of potassium makes it useful for dating rocks?
It has a long half-life
The image shows sedimentary rock layers. According to the law of superstition, which layer is the oldest?
1
The fossil record helps scientists identify a single species from which other organisms have descended. This single species refers to common ancestors.
A species can be defined as a group of organisms that can significantly reproduce with each other in nature to produce fertile offspring. Each natural species has its own characteristics to survive in it.
The fossil record illustrates significant information about the evolution of organisms of a single species. This single species existed before and is thus known as the common ancestor. The evolutionary process took place gradually in this species to form the newest organism. Therefore, the fossil record helps scientists identify the single species from which other organisms are derived. This single species suggests a common ancestry.
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Is the Oceanic-Continental boundary and Continental-Oceanic boundary the same?
What city lies at 56 degrees North and 38 Degrees East
Answer:
Shchyolkovsky District
Explanation:
The Shchyolkovsky District lies at 56 N, 38 E. Hope this helps!
How do I water and minerals get into a plant??
Answer:
minerals in the soil make the plant grow and water keeps it alive by sending water to its leaves
Explanation:
Answer: The roots
Explanation:
Most plants obtain the water and minerals they need through their roots. The path taken is: soil -> roots -> stems -> leaves. The minerals (e.g., K+, Ca2+) travel dissolved in the water (often accompanied by various organic molecules supplied by root cells).
Could there be an edge of the Universe?
Answer:
As far as we know, universe is an infinite space with no limit. So there is a great possibility of existence of aliens, who knows? Maybe they already know us but G0v. decide to hid it from us...
Explanation:
Outsourced jobs are common in trade, service, and __________ industries. A. mining B. forestry C. livestock D. manufacturing
Answer:
manufacturing
Explanation:
Answer:
Explanation:
d
Prepare all required journal entries (if any) at December 31, 2021. The fair value of the equipment at December 31, 2021, is estimated to be $7,257,000
Based on the information provided, it appears that there may be an impairment of the equipment on December 31, 2021. To prepare the required journal entries, the following steps should be taken:
1. Determine the carrying value of the equipment on December 31, 2021. This can be calculated by subtracting accumulated depreciation from the original cost of the equipment.
2. Compare the carrying value of the equipment to its fair value. If the fair value is less than the carrying value, then an impairment loss must be recognized.
3. To recognize an impairment loss, the following journal entry should be recorded:
Impairment Loss Expense $X
Accumulated Depreciation $Y
Equipment $Z
Where X is the amount of the impairment loss (which is equal to the carrying value minus the fair value), Y is the accumulated depreciation on the equipment, and Z is the original cost of the equipment.
4. Finally, the carrying value of the equipment should be adjusted to its fair value by recording the following journal entry:
Equipment $7,257,000
Accumulated Depreciation $Y
Impairment Loss Expense $X
Where $7,257,000 is the fair value of the equipment, Y is the accumulated depreciation on the equipment, and X is the amount of the impairment loss.
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How is information passed from the retina to the brain?
A. Sent through chemical signals
B. Sent through electrical signals
C. Carried through fluid
D. Carried through bone
Answer:
B. Sent through electrical signals
Explanation:
Information is passed from the retina to the brain via electric signals through the optic nerves. The optic nerves are a very important part of the visual system of the body in that they carry electric signals from the retina to the brain.
The brain therefore interprets the signal and conceptualizes it. Light on the retina stimulates the cones and rods which in turn generate electrical signals.Answer:
Yeah the correct answer is B. Sent through electrical signals
Explanation:
where is the capital of usa located
Answer: Maryland, Washington DC
Please help me with this question, thank you so much!
3. Illustrates how inefficiencies can lead to deforestation, and identify the sources.
The illustration of how inefficiencies can lead to deforestation and some of the sources involved,
1. Unsustainable Agricultural Practices
2. Illegal Logging
3. Land Conversion for Development
4. Fuelwood Collection
5. Mining Activities
1. Unsustainable Agricultural Practices: Inefficient and unsustainable agricultural practices, such as slash-and-burn farming or large-scale monoculture, can result in deforestation. When land is not managed properly, forests are cleared to make way for agricultural activities, leading to habitat destruction and loss of biodiversity.
2. Illegal Logging: Inefficient regulation and enforcement of logging practices can lead to rampant illegal logging activities. When logging is done unsustainably, without proper replanting or selective cutting, it can result in extensive deforestation. This is often driven by the demand for valuable timber and contributes to habitat loss and ecosystem degradation.
3. Land Conversion for Development: Inefficient land use planning and urban expansion can lead to deforestation. When there is a lack of consideration for the ecological value of forests and the importance of preserving them, forests may be cleared to make room for infrastructure development, housing projects, or industrial complexes.
4. Fuelwood Collection: Inefficient use of fuelwood as a primary energy source, particularly in developing countries, can contribute to deforestation. When communities heavily rely on forests for firewood and cooking fuel without sustainable alternatives or efficient technologies, it can lead to overexploitation and degradation of forest resources.
5. Mining Activities: Inefficient mining practices, particularly illegal and unregulated mining, can result in deforestation. Mining operations often involve clearing large areas of forests to access mineral deposits. Poor waste management and improper reclamation of mined areas further exacerbate the environmental impact and contribute to deforestation.
Overall, addressing these inefficiencies requires sustainable land management practices, stricter regulation and enforcement, promoting alternative energy sources and encouraging responsible consumption and production patterns to mitigate deforestation and its detrimental effects on ecosystems and communities.
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What three continents are partly in the Eastern and Western Hemisphere
Answer:
Asia, Australia, North and South America
Explanation:
if this amount of slip is the average value for this section of the san andreas, how many earthquakes were likely needed to accumulate the present offset of wallace creek? g
To determine the number of earthquakes likely needed to accumulate the present offset of Wallace Creek, we would need specific information about the slip rate and the average slip per earthquake in that section of the San Andreas Fault.
How to get the slip amountThe number of earthquakes required to accumulate a given offset depends on various factors, including the slip rate (the average rate at which the plates are slipping past each other), the average slip per earthquake, and the time period over which the slip has occurred. T
These factors can vary significantly along different sections of the fault.
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what does it mean to 2.25 times bigger than earth
When something is stated to be "2.25 times bigger than Earth," it means that the object's size or volume is 2.25 times larger than that of Earth.
To calculate the size or volume of the object, you would multiply the Earth's size or volume by 2.25 times. This helps you understand the relative size of the object in comparison to our planet. When something is said to be 2.25 times bigger than Earth, it means that its size is 2.25 times the size of Earth. This could refer to a planet, a moon, or any other object in space. Essentially, if you were to compare the size of the object to Earth, it would be 2.25 times larger.
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Someone pls help me?
!
Answer: it is 11:30am
Explanation:
PLS HELP I'll mark the best answer brainliest
DON'T PUT ANY LINKS!!!! pls and thank you U-U
Sarah took two pancakes and put the cut edge just on top of the other cut edge so that the edge of one sits over the edge of the other. Then she pushed the two halves together slowly. Describe what happens and tell what type of mountain range this represents.
Answer:
When she pushes the two halves of pancakes slowly, I think the 2 pancakes won't fall down.
Explanation:
....
most fossils are found in sedimentary rocks because a. animals and plants cannot live in metamorphic or igneous rocks. b. erosion that uncovers igneous and metamorphic rocks poisons the soil and water. c. sedimentary rocks form in the same environment where the plants and animals lived and died. d. the clastic and chemical cements that lithify sedimentary rocks mummify the dead animals and plants.
Answer:
c. Sedimentary rocks for in the same environment where the plants and animals lived and died.