Facts: Rocks and Fossils - Typing Practice Lesson
Kinds of rock, fossils and erosion
Building Fluency
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Geologists sort rocks into three groups. Igneous rocks form when hot, melted rock cools and hardens. Sedimentary rocks form from layers of sand, mud and shells pressed together over a long time. Metamorphic rocks form when heat and pressure deep underground change one kind of rock into another.
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Tip: Hard Words
Slow down for words like sedimentary and metamorphic, then pick the pace back up.