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Practice Speaking: Read Aloud
ID: #51755
Long Rock
Most rocks are made of minerals containing silicon and oxygen, the most abundant elements in the Earth's crust. There are three kinds of rock: igneous, sedimentary and metamorphic. Igneous rocks form when molten rock cools and solidifies. Sedimentary rocks originate when particles settle out of water or air. Metamorphic rocks result when existing rocks are changed by heat or pressure.
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