IGNEOUS ROCK, IS FORMED BY VOLCANOES WHEN THE LAVA COOLS., SEDIMENTARY ROCK, IS MADE OF LAYERS OF SAND, CLAY, DEAD SEA ANIMALS AND PLANTS., METAMORPHIC ROCK, IS FORMED BY HEAT AND PRESSURE, ROCKS, GROUPS OF MINERALS. THEY CAN BE CLASSIFIED INTO THREE GROUPS., MINERALS, SOLID MATERIALS THAT CAN BE FOUND IN NATURE. .

DEFINITIONS (rocks and minerals):

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