Describe the composition and physical properties of the crust

The earth is divided into three layers,a crust, a mantle and a core, that differ in the chemical composition

I thought of pizza when I saw this question

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.

None   they are   equally likely to occur on any plate boundary