RLAF+5.1

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Vocab:
texture- the look and feel of the rock's surface grains-particles of minerals or other rocks igneous rock-forms from the cooling of molten rock sedimentary rock- forms when particles of other rocks or the remains of plant's and animal's are pressed and cemented together metamorphic rock- formed when an existing rock is changed by heat, pressure, or chemical reactions

Outline

 * How Geologists Classify Rocks**
 * rocks are important for building
 * rocks form mountains, hills, valleys, beaches, and the ocean floor
 * earth's crust is made of rock
 * geologists collect and study to classify rocks
 * Texture**
 * texture is the look and feel of a rock's surface
 * grains give the rock its texture
 * Grain Size**
 * usually grains of rocks are visible
 * rocks that are fine-grained are so small you can't see them
 * Grain Shape**
 * some grains look like sand
 * others look like seeds or exploding stars
 * some grains are rounded
 * some grains are jagged