Rocks are a naturally occurring solid material consisting of one or more minerals.
Rocks are everywhere, in the ground, forming mountains, and at the bottom of the ocean. Earth s outer layer is made mostly of rock, or crust, is made mostly of rock. Igneous rocks are formed from the magma, which is emitted by volcanoes. Sedimentary rocks are formed at the Earth s surface from weathered and eroded fragments of pre-existing rocks. Students will be able to recognize a volcano and learn how it erupts.