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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