What makes Earth’s crust conducive for living organisms to survive?

The earth's crust is very important to human beings not only because they live in it but because of the socio-economic benefits it offers them. ... Some of these less dense rocks, such as granite, are common in the continental crust but rare to absent in the oceanic crust. Both the continental and oceanic crust mantle.

Answer glacier terminus;

Answergranulation;