Rocks

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Rocks
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Types of Rocks
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Sedimentary RocksHow They are Made

• Wind and water break down the earth
• Bits of earth settle in lakes and rivers
• Layers are formed and build up
• Pressure and time turn the layers to rock

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Types of Sedimentary Rocks
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Metamorphic RocksWhat are They?

• Rocks that have changed
• They were once igneous or sedimentary
• Pressure and heat changed the rocks

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Types of Metamorphic Rocks
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Igneous RocksWhat are They?

• Fire Rocks
• Formed underground by trapped, cooled magma
• Formed above ground when volcanoes erupt and
  magma cools

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Types of Igneous Rocks
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Rocks Have Been Used For Many Years and For
Many Things
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Rocks
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Rock group Formed Examples and locations Uses
Igneous When lava or magma cooled and hardened in or on the crust Granite Wicklow Mountains Basalt Giants Causeway, Co. Antrim Granite worktops Basalt in tarmac to surface roads etc

Sedimentary The compressed bits of plants, animals or other rocks Limestone central plain of Ireland Sandstone Comeragh mtns, Waterford/Cork Limestone front of buildings, cement Sandstone cement blocks

Metamorphic Other rocks changed by heat or pressure Marble Co.Kilkenny Quartzite Mt. Errigal, Donegal Marble fireplaces and headstones Quartz jewellery and road surfaces