We should tell our parents that when they are old there gonna need somone to help them and that we’re always gonna be there for them when there old just like they should be there for your grandparents
Answer:
The Earth's outer crust (the lithosphere) is composed of a series of tectonic plates that move on a hot flowing mantle layer called the asthenosphere. Heat within the asthenosphere creates convection currents that cause tectonic plates to move several centimeters per year relative to each other.
