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Questions and Answers
What are the sources of heat that contributed to Earth's hot interior?
What are the sources of heat that contributed to Earth's hot interior?
- Volcanic heat, earthquake heat, geothermal heat, and tidal heat
- Heat from Earth's core, frictional heat, heat from the Sun, and heat from the Moon
- Solar energy, geothermal energy, tidal energy, and wind energy
- Accretion energy, adiabatic compression, core formation energy, and decay of short-lived radioisotopes (correct)
What is the role of radioactive decay in Earth's heat production?
What is the role of radioactive decay in Earth's heat production?
- Radioactive decay is responsible for the Earth's magnetic field
- Radioactive decay causes earthquakes and volcanic eruptions
- Radioactive decay is the primary source of geothermal energy
- Radioactive decay from isotopes like K40, Th232, U235, and U238 continuously produces heat over geologic time (correct)
How does pressure influence the melting temperatures of rocks?
How does pressure influence the melting temperatures of rocks?
- Pressure, in addition to temperature, influences the melting temperatures of rocks. Melting occurs at higher temperatures with increased depth due to the increase in confining pressure exerted by the weight of overlying rocks (correct)
- Reducing confining pressure raises a rock's melting temperature, and decompression melting is triggered
- Increasing pressure lowers a rock's melting temperature
- Pressure has no influence on the melting temperatures of rocks
What is the geothermal gradient and how does it vary in different parts of the Earth?
What is the geothermal gradient and how does it vary in different parts of the Earth?
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What triggers decompression melting in rocks?
What triggers decompression melting in rocks?
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