cools down some magma does not comes out spreads over land area cools down some magma comes out break through cracks Begin here: Magma Formation Extrusive Igneous Rock Intrusive Igneous Rock
When magma reaches the surface through a volcano, it is called lava. When lava cools, it forms extrusive igneous rock. The process by which rocks are worn down by wind and water, creating sediment.haha
