According to the geothermal gradient, rocks buried 75 km beneath the surface would normally be

step 1 In number 72, they are extracting heat from hot rocks, hot granite, by drilling holes and runnin

According to the geothermal gradient, rocks buried 75 km...

According to the geothermal gradient, rocks buried $75 \mathrm{~km}$ beneath the surface would normally be at what temperature?
At $75 \mathrm{~km}$ depth, rocks will be heated to about ________ degrees Celsius.
a. 1500
b. 1250
c. 1000
d. 750

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Key Concepts

Lithospheric Thermal Structure

The lithospheric thermal structure describes how temperature varies within the Earth's lithosphere, which includes the crust and the uppermost mantle. This structure is influenced by the geothermal gradient, radiogenic heat production, and the physical properties of rocks, and it is key to making predictions about temperatures at specific depths, such as 75 km in this scenario.

Geothermal Gradient

The geothermal gradient is the rate at which temperature increases with depth beneath the Earth’s surface. It is typically expressed in degrees Celsius per kilometer and is used to estimate subsurface temperatures based on the depth of burial. This concept is fundamental for understanding thermal conditions in the Earth's interior.

Heat Transfer Mechanisms

Heat within the Earth is transferred through conduction and convection. In the shallow crust, conduction is the dominant process, whereby heat moves by molecular vibration through rocks; in deeper regions, convection within the mantle plays a significant role. Recognizing these mechanisms is essential for applying the geothermal gradient to estimate temperature distributions at various depths.

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