Presentation on theme: "Types of Rocks There are three main types of rocks:"— Presentation transcript:
1Types 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.
2Igneous RocksThese are rocks formed by the cooling of molten rock (magma.)magmavolcanoMagma cools and solidifies forming igneous rocks
3Sedimentary RocksSedimentary Rocks are rocks formed when particles of sediment build up and are “cemented together” by the effect of pressure and minerals.Getting olderseaFragments washed to the seaSedimentaryrocksRocks are brokenup by the actionof weather
4Metamorphic RocksMetamorphic 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.MagmaPressure from surface rocksmetamorphicrockforminghereheat
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