JLKR+5.1

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Vocabulary

 * texture-** the feel and look of a certain rock's surface.
 * grains-** what geologists call- the particles of minerals or other rocks that most rocks are made of.
 * igneous rock-** forms from the cooling of molten rock (either magma below or above the surface.)
 * sedimentary rock-** forms when the particles of other rocks or the remains of plants and animals are pressed and cemented together.
 * metamorphic rock-** forms when an existing rock is changed by heat, pressure, or chemical reactions.

How Geologist Classify Rocks

 * To classify rocks, geologist collect and study samples of rocks.