Igneous Rock and Earth Movement
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A tectonic plate is a slab of solid rock that is floating on top of magma. They are contained in the lithosphere of the Earth.
The reason why I brought you to the beach is because there are 2 types of tectonic plates. One is the continental plate and the other is the oceanic plate.
Plate tectonics are actually flexible even though they are solid rock. In fact they actually move around the Earth.
Tectonic plates move when magma reaches a point where it has to follow the rule of convection. Convection is when hot air, liquid or gas rises and the cold substances drop.
As magma rises from heat it also cools when it reaches towards the surface which results in it dropping again. So basically magma goes in a circular cycle.
In this circular process the magma moves the plates that are on top of it.
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