Question

which description tells two processes scientists think move earths lithospheric plates?
friction between the plate and the asthenosphere and pressure of magma on the edge of the plate
convection in the mantle and pressure of magma on the edge of the plate
gravity acting on the edges of plates and convection in the mantle
gravity acting on the edges of plates and friction between the plate and the asthenosphere

Explanation:

Scientists believe that convection currents in the mantle (which are driven by heat from the Earth's interior) and the force of gravity acting on the edges of the plates (such as slab - pull, where a dense, cold oceanic plate sinks into the mantle) are two main processes that move Earth's lithospheric plates.

Answer:

gravity acting on the edges of plates and convection in the mantle