C the lithosphere ........A condition of gravitational and buoyant equilibrium between Earth's lithosphere and asthenosphere.
Plastic deformation occurs when pressure is applied to a substance and this results in a change of shape of the solid. This occurs to rocks when they undergo metamorphism by pressure. A metamorphic rock is formed by the transformation of preexisting solid rocks under the influence of temperature and pressure. Extreme pressure in metamorphism causes some rocks to be foliated or have a banded appearance. Granite undergoes metamorphism to form gniess.
If upwelling stopped it would cause the food chain to break thus causing the fisheries to collapse
