Figure 9-18: R I V U X G
Igneous, Sedimentary, and Metamorphic Rocks (a) Igneous rocks such as basalt are created when molten materials solidify. This example contains iron-rich minerals that give it its dark color. (b) Sedimentary rocks such as sandstone are typically formed when loose particles of soil or sand are fused into rock by the presence of other minerals, which act as a cement. (c) Metamorphic rocks are produced when igneous or sedimentary rocks are subjected to high temperatures and pressures deep within Earth’s crust. Marble is formed from sedimentary limestone; schist is formed from igneous rock.
Igneous, Sedimentary, and Metamorphic Rocks (a) Igneous rocks such as basalt are created when molten materials solidify. This example contains iron-rich minerals that give it its dark color. (b) Sedimentary rocks such as sandstone are typically formed when loose particles of soil or sand are fused into rock by the presence of other minerals, which act as a cement. (c) Metamorphic rocks are produced when igneous or sedimentary rocks are subjected to high temperatures and pressures deep within Earth’s crust. Marble is formed from sedimentary limestone; schist is formed from igneous rock.
(a: Doug Martin/Science Source; b: Dorling Kindersley/Getty Images; c: Juniors/Superstock)