Geothermal presure.
the flow of magma in eath's crust is called lava.
magma
Lava
Magma, or pyroclastic flow.
Gyres
The tectonic plates push together thus causing magma to shoot up and rise hence an eruption
the flow of magma in eath's crust is called lava.
magma
The force that causes most of the plate movement is thermal convection, where heat from the earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the of plate the crust along with them.
The earth's crust moves because the earth has tectonic plates that move because the magma under the earth's surface is constantly boiling. Since the water moves, it causes the earth's crust to move.
Lava
Magma, or pyroclastic flow.
Gyres
The oceans flow to the places where the crust is the lowest. Gravity causes them to flow downward. The mantle, below the crust, is at the same depth everywhere, so if the crust is lower, it is because it is thinner.
A lava flow may flow over the surface from a fissure deep enough to reach the magma layer. Or, if under pressure, an eruption from a volcano.
I believe the answer you may be looking for is either Lava or a Volcano
Magma is the molten rock below the crust, in the mantle. Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth's crust.