Scientists believe convection currents are the force behind the plate tectonics theory.
Answer:
1) The Big Crunch. 2) The Big RIP.
Explanation:
For The Big Crunch is that's where gravity takes. For The Big RIP is where the expansion of the universe just gets faster until galaxies, planets, stars, atoms and space gets ripped apart.
Two ways a ocean can affect the coastline by one Making it to what the people eat and also what the people live in. Also it affects the supplies and enviroment