diamonds form at pressures of about 10 gpa. determine which layer of the earth they form in.

Diamonds form at pressures of about 10 GPa, which corresponds to formation depths in the Earth's mantle, specifically in the lithospheric mantle layer. This typically occurs at depths of about 140 to 200 kilometers below the Earth's surface, where the pressure and temperature conditions are suitable for diamond formation. The mantle is the second layer of the Earth beneath the crust. These diamonds are often brought to the surface by volcanic eruptions through kimberlite pipes. Thus, diamonds forming at around 10 GPa form in the Earth's mantle layer. This pressure condition is too high for the crust and too low for the outer or inner core, confirming the mantle as the formation zone for diamonds at about 10 GPa pressure.