Earth surface is made up of about 29% land. Part of this include mountains, plains, and islands. Which subsystem is this describing? А. Hydrosphere B. Biosphere С. Lithosphere D. Atmosphere

B. Biosphere
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Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

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