Earth Processes and Magma Formation Quiz

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)

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)

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

<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</p> Signup and view all the answers

<p>Reducing confining pressure lowers a rock's melting temperature, and decompression melting is triggered</p> Signup and view all the answers