RLNI+5.1

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Vocabulary

 * Texture**: look and feel of rock's surface
 * Grain**:particles of minerals or other rocks
 * Igneous Rock**:forms from cooling of molten rock
 * Sedimentary Rock**: forms when particles of other rocks or the remains of plants and animals are pressed and cemented together
 * Metamorphic Rock**:forms when existing rock is changed by heat, pressure, or chemical reactions

Outline

 * How geologists classify rocks
 * when studying rock, geologists observe rocks'
 * color
 * texture
 * mineral composition
 * Texture
 * useful when identifying rocks
 * some rocks are
 * smooth and glassy
 * rough and chalky
 * to describe rock's texture
 * use size, shape, and pattern
 * grain size
 * grain shape
 * grain pattern
 * no visible grain
 * Mineral composition
 * test rock with acid to determine if rock contains carbonates
 * Origin
 * 3 major group of rocks
 * igneous rocks
 * forms when molten rock cools
 * sedimentary rocks
 * forms when particles of rock, plants, and animals are pressed and cemented together
 * metamorphic rocks
 * forms when existing rock is changed by heat, pressure, or chemical reactions