The geothermal gradient Choose one:
A. averages about 5°C per kilometer in the upper crust.
B. indicates that temperatures near the mantle-core boundary may exceed the temperature of the Sun's surface (5,500°C).
C. increases exponentially as you go deeper into the Earth.
D. is the rate of change in temperature with depth within the Earth.

(C) increases exponentially as you go deeper into the Earth.

Explanation:

Geothermal gradient is the amount that the Earth's temperature increases with depth. It indicates heat flowing from Earth's warm interior to its surface. Temperature within the Earth increases with depth, this is due to the high viscous or partially molten rock found at the margins of the tectonic plates.

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