The lithosphere is divided into lots of slabs called tectonic plates.
The plates are moving due to convection currents in the asthenosphere.
The places where they meet are called boundaries or plate margins.
The idea that the Earth's lithosphere is made up of many plates that are moved around by convection currents is theory of plate tectonics.
Radioactive decay of elements e.g. Uranium in the mantle and core generates a lot of heat.
When lower parts of the asthenosphere heat up they become less dense and slowly rise.
As they move towards the top of the asthenosphere they cool down, becoming more dense, then slowly sink.
These circular movements of semi-molten rock are called convection currents.
Convection currents in the asthenosphere create drag on the base of the tectonic plates and causes them to move
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