Part 2: Where do different kinds of rocks form?
Igneous rocks that form under Earth’s surface are called intrusive. Intrusive igneous rocks usually have large mineral grains because they form from magma that cools slowly. Igneous rocks that form above ground are extrusive.
Extrusive igneous rocks have small mineral grains or no grains at all because they form from lava that cools quickly.
Heat and/or pressure underground causes the minerals in metamorphic rock to form bands or become "cooked."
Sedimentary rocks form where sediments (pebbles, sand, silt, clay) form layers.
Other Answer Choices:
Intrusive igneous rocks
Extrusive igneous rocks
Metamorphic rocks
Sedimentary rocks