C.K.K.K.+5.1

toc =Section 1 (5-1) Classifying Rocks=

Vocabulary
texture- the look and feel of the rocks surface grains- particles of minerals that form rocks igneous rock- it forms from the cooling of molten rock, which could be magma underground or lava on the surface sedimentary rock- are formed when humus, or the remains of plants and animals are crushed together and form rocks metamorphic rock- are formed when existing rocks are changed by chemical reactions, heat, and also pressure

**Rocks**

 * a rock is a tough piece of the earth's crust
 * rocks are made up of minerals and other materials
 * rocks are like the earth's and moons building blocks
 * on our planet they form
 * mountains
 * hills
 * valleys
 * beaches
 * ocean floor

**Classifying Rocks**

 * when studying rocks geologists take a look at the
 * color
 * texture
 * and declare its chemical composition
 * using the facts listed above geologists can classify a rock according to
 * its origin
 * where and how it formed

**Rock Groups**

 * igneous rocks
 * it forms from the cooling of molten rock, which could be magma underground or lava on the surface
 * sedimentary rocks
 * are formed when humus, or the remains of plants and animals are crushed together and form rocks
 * usually forms in layers underground
 * metamorphic rocks
 * are formed when existing rocks are changed by chemical reactions, heat, and also pressure
 * metamorphic rocks mostly forms many very deep inside the earth