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The Earth's Internal Heat Budget

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Questions and Answers

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?

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?

30%

0.3%

0.03% (correct)

What is theorized to sustain Earth's magnetic field?

Geodynamo (B) Signup and view all the answers

How much is the estimated flow of heat from Earth's interior to the surface?

47±2 terawatts (TW) (D) Signup and view all the answers

Where does most of the water on Earth come from?

Saline seawater (D) Signup and view all the answers

What is the average salinity of saltwater on Earth?

3.5% (D) Signup and view all the answers

What percentage of water on Earth is saline or saltwater?

97% (D) Signup and view all the answers

What is the salinity level that defines fresh water?

1% (A) Signup and view all the answers

What is water with a salinity between 1‰ and 0.35‰ typically referred to as?

Marginal water (B) Signup and view all the answers