What is the crust and uppermost mantle make up the rigid outer layer of earth called

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

And give a detailed description! scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. does this result support the theory of plate tectonics? why or why not?

Which layer will become saturated first when rain falls?