Simplify the following text for a Grade 8 native English-speaking person.
Original: Igneous rock is made when the lava ( melted rock on the surface of the Earth ) or magma ( melted rock below the surface of the Earth ) cools down and becomes hard . Igneous rock formed from magma that has become solid inside the earth is called intrusive igneous rock .
Simplified: When a rock crystallizes from melt ( magma and\/or lava ) , it is an igneous rock .