page_title: Rock (geology)
hierarchical_section_title: Rock (geology)
context_page_description: A rock is a naturally occurring solid. It is made of minerals, or other mineral-like substances. The Earth's outer solid layer, the lithosphere, is made of rock. That means the Earth's crust is made of rock. The different minerals in the rocks make different kinds of rock.
  Rock is often covered by soil or water. It is beneath the oceans, lakes, and rivers of the earth, and under the polar icecaps. Petrology is the scientific study of rocks.
context_section_description: A rock is a naturally occurring solid. It is made of minerals (which are crystalline), or other mineral-like substances. The Earth's outer solid layer, the lithosphere, is made of rock. That means the Earth's crust is made of rock. The different minerals in the rocks make different kinds of rock. 
  Rock is often covered by soil or water. It is beneath the oceans, lakes, and rivers of the earth, and under the polar icecaps. Petrology is the scientific study of rocks.
caption: The rocky side of a mountain creek near Orosí, Costa Rica.
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