Types of Rocks
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Types of Rocks • There are three main types of rocks: 1. 1. Igneous Igneous - formed when molten rock cools. 2. 2. Sedimentary Sedimentary – formed by the “cementing together” of small grains of sediment. 3. 3. Metamorphic Metamorphic – rocks changed by the effect of heat and pressure.
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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. - PowerPoint PPT Presentation
Transcript of Types of Rocks
Types of Rocks
• There are three main types of rocks:
1.1. IgneousIgneous - formed when molten rock cools.
2.2. SedimentarySedimentary – formed by the “cementing together” of small grains of sediment.
3.3. MetamorphicMetamorphic – rocks changed by the effect of heat and pressure.
Igneous Rocks
• These are rocks formed by the cooling of molten rock (magma.)
magma
volcanoMagma cools and solidifies forming igneous rocks
Sedimentary Rocks• Sedimentary Rocks are rocks
formed when particles of sediment build up and are “cemented together” by the effect of pressure and minerals.
sea
Fragments washed to the sea
Sedimentary rocks
Rocks are brokenup by the actionof weather
Gettin
g o
lder
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.
Magma
metamorphic
rockforming
here
heat
Pressure from surface rocks
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