Convection causes large masses of rock to rise from and sink into Earth's mantel. The main heat source for this movement is
1.Earth's maritle and core.
2.Friction produced by plate motions.
3.Radiation from the sun
4.Magma in Earth's crust.

Respuesta :

Answer:

magma in Earth's crust

Explanation:

the magma comes with such force hence either forces the earth to sink or raise