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Reading Comprehension Worksheet and Kid's Fable - 'Rocks' - K5 Learning

igneous rocks. Igneous rocks have glass crystals filled with minerals in them. They do not usually have layers, and are very smooth. The third type of rock is the metamorphic rock. These rocks are formed when the other types of rocks are subjected to intense heat and pressure to change them. Metamorphic rocks are hard and smooth, like igneous ...