Magma is heated to its molten state via heat from the Earth's core and that heat is held in by the earths crust. Once on the surface there is nothing to keep it molten and is it cooled by the outside air.
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When magma erupts on to the earth's surface it hardens and forms new land.It depends on if your talking about magma or lava, lava is on the surface of the Earth and magma is inside (underground).
Lava is magma that has reached the surface.
Sedimentary rocks form on the Earth's crust, and can form metamorphic rocks when buried. Igneous rocks form under the surface, or when liquid magma reaches the surface as lava.
it's lava but in it's liquid form. A common misconception between magma and lava is lava is solid and magma is liquid hot.
Diorite is formed by the cooling of intermediate magmas underground.