voalcano erupt
running water.
running water
Inertia.
gravity
FALSE: gravity cannot force magma upwards, gravity can olny force downwars. the reason magma shoots from the earths interior is because the pressure from the magma trying to push through the force gravity causes an eruption.
running water.
erosion
They slowly change the shoreline by moving sand.
It will be 4 times as great
Of course, otherwise there would no acceleration (change of velocity).
If the elevator accelerates, the acceleration will provide an additional apparent force.
Centrifugal force.
Constructive Force
I am not entirely sure what you are after, but your weight will change depending on the distance from Earth's center. The force of gravity depends on distance.
running water.
running water
Inertia.