Original: The temperature of the crust increases with depth , reaching values typically in the range from about 200 ° C ( 392 ° F ) to 400 ° C ( 752 ° F ) at the boundary with the underlying mantle .
Simplified: The temperature of the crust increases with depth . Where the crust meets the mantle the temperatures can be between 200 ° C ( 392 ° F ) to 400 ° C ( 752 ° F ) .