Earth Processes and Magma Formation Quiz

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Questions and Answers

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?

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?

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?

<p>The geothermal gradient refers to the increase in temperature with depth into the Earth. The temperature gradient in the Earth's crust is approximately 25°C per kilometer, while in the mantle, it ranges from 0 (B)</p> Signup and view all the answers