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Questions and Answers
Which two sources contribute to the flow of heat from Earth's interior to the surface?
Which two sources contribute to the flow of heat from Earth's interior to the surface?
- The flow of heat from Earth's interior is not related to either radiogenic heat or primordial heat.
- The flow of heat from Earth's interior is solely due to the primordial heat left over from the formation of Earth.
- The flow of heat from Earth's interior is due to the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, as well as the primordial heat left over from the formation of Earth. (correct)
- The flow of heat from Earth's interior is solely due to the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust.
Which geological processes are powered by Earth's internal heat?
Which geological processes are powered by Earth's internal heat?
- Photosynthesis and respiration
- Weathering and erosion
- Atmospheric circulation and ocean currents
- Mantle convection and plate tectonics (correct)
What percentage of Earth's total energy budget at the surface is contributed by Earth's interior heat?
What percentage of Earth's total energy budget at the surface is contributed by Earth's interior heat?
- 30%
- 0.3%
- 3%
- 0.03% (correct)
What is theorized to sustain Earth's magnetic field?
What is theorized to sustain Earth's magnetic field?
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How much is the estimated flow of heat from Earth's interior to the surface?
How much is the estimated flow of heat from Earth's interior to the surface?
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Where does most of the water on Earth come from?
Where does most of the water on Earth come from?
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What is the average salinity of saltwater on Earth?
What is the average salinity of saltwater on Earth?
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What percentage of water on Earth is saline or saltwater?
What percentage of water on Earth is saline or saltwater?
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What is the salinity level that defines fresh water?
What is the salinity level that defines fresh water?
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What is water with a salinity between 1‰ and 0.35‰ typically referred to as?
What is water with a salinity between 1‰ and 0.35‰ typically referred to as?
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