What is the difference between atherosclerosis and arteriosclerosis

Atherosclerosis is the accumulation and build-up of plaque inside the arterial walls and arteriosclerosis is the hardening or thickening of the arterial walls.

Explanation: I hope this helps :) You've got this!

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.