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Rocks - Coggle Diagram
Rocks
Igneous
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Granite
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Formed when magma forced its way into the crust and cooled very slowly over millions of years. Large crystals (e.g. quartz) formed and then came to the surface when overlaying rocks eroded away.
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Basalt
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Formed when lava spread out across Earth's surface and cooled and solidified very quickly due to air exposure. As a result, the crystals are tiny and cannot be seen by naked eye.
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Found: Antrim-Derry Plateau, Giant's Causeway
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Sedimentary Rocks
Formed from the remains (sediments) of other rocks, plant life and animal life. These sediments are deposited on the beds of seas and lakes and on land. They are then compressed and cemented together.
Limestone
Formed on the beds of shallow, warm seas by the skeletons of sea creatures and shells. Over millions of years, these build up and the particles are compressed together.
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Found: Burren, Co. Clare and the Central Plain of Ireland.
Sandstone
Formed when large amounts of sand were worn away from the Earth's surface and deposited in deserts and the beds of lakes and seas. It compressed into sandstone.
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Found: Mountains of Munster, e.g. McGillycuddy's Reeks, the Galtees and the Comeraghs.
Metamorphic
Formed when existing rock types come into contact with great heat and pressure. This causes changes in both shape and form.
Marble
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Pure marble is white but minerals can cause it to be red, green or black
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Found: Rathlin Island, Connemara, Cork
Quartzite
Formed when sandstone came into contact with magma deep in Earth's crust. Usually happened during periods of folding. Grains of quartz that are tightly packed together.
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Found: Croagh Patrick, Co. Mayo
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