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irondevil
Do you mean like magma moving in the Earth and the tectonic plates moving? It's due to convection currents in the magma in the Mantle. Hotter and cooler parts moving and therefore allowing the plates to move as well as 'matter'. 

I hope this helps in some way 
It is because earth exerts it's Gravitation force on it so, they move around within the Earth instead of traveling in a straight line

Hope this helps!

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