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Types of Rocks

Types of Rocks. There are three main types of rocks: Igneous - formed when molten rock cools . Sedimentary – formed by the “cementing together” of small grains of sediment. Metamorphic – rocks changed by the effect of heat and pressure. volcano. magma. Igneous Rocks.

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Types of Rocks

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  1. Types of Rocks • There are three main types of rocks: • Igneous - formed when molten rock cools. • Sedimentary – formed by the “cementing together” of small grains of sediment. • Metamorphic – rocks changed by the effect of heat and pressure.

  2. volcano magma Igneous Rocks • These are rocks formed by the cooling of molten rock (magma.) Magma cools and solidifies forming igneous rocks

  3. Fragments washed to the sea Rocks are broken up by the action of weather sea Sedimentary rocks Getting older Sedimentary Rocks • Sedimentary Rocks are rocks formed when particles of sediment build up and are “cemented together” by the effect of pressure and minerals.

  4. Pressure from surface rocks metamorphic rock forming here Magma heat Metamorphic Rocks • Metamorphic rocks are formed by the effect of heat and pressure on existing rocks. • This can greatly affect the hardness, texture or layer patterns of the rocks.

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