Why do the plates that make up the Earth's crust move? 1. because the Earth's outer crust is thin

2. because the Earth's inner core is solid

3. because pressure within the planet forces them to shift


I think its 2 or 3

Explanation:

The plates can be thought of like pieces of a cracked shell that rest on the hot, molten rock of Earth's mantle and fit snugly against one another. The heat from radioactive processes within the planet's interior causes the plates to move, sometimes toward and sometimes away from each other.

the answer is b. apsidal precession