Rocks - kelgeography.webs.com - Copy.pdf · seen best in the Burren in Co. Clare. •It is used to...
Transcript of Rocks - kelgeography.webs.com - Copy.pdf · seen best in the Burren in Co. Clare. •It is used to...
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Material that forms the earth’s crust.
ROCKS
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What are rocks made from?
•These minerals are held together by a natural cement.
•Rocks are made up of different minerals.
•There are many different types of rocks with different mineral content, hardness, and texture.
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Types of Rocks • There are many different
types of rocks.
• However, all rocks can be divided into 3 groups, depending on how they were made.
• The 3 groups are,
1. Igneous rocks
2. Sedimentary rocks
3. Metamorphic rocks
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Types of Rocks
• Igneous Rocks – They are formed as a result of volcanic activity. Hot molten magma cools into solid rock on the earth’s surface or deep underground.
•Sedimentary Rocks – They are formed from the
particles of rocks, dead plants, and animals. •Metamorphic Rocks – They are formed from rocks
that already exist. Igneous or sedimentary rocks are changed into new harder rocks by great heat or pressure.
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Igneous Rocks
• Igneous rocks are formed as a result of volcanic activity.
• Two common types of igneous rocks are Granite and Basalt.
• Granite is made when magma cools very slowly, deep in the earth’s crust. Over millions of years the layers of rock above the granite are worn away, leaving the granite exposed at the surface.
Granite is
found in the
mountains of
Wicklow
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Igneous Rocks
•Basalt is made when lava from a volcano cools very quickly on the earth’s surface. It is black in colour and is shaped as hexagonal blocks, as seen in the Giant’s Causeway in the Antrim-Derry Plateau.
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Sedimentary Rocks • Sedimentary rocks are made up of small particles or sediments
which are compressed together to form layers of solid rock.
• They were deposited on the bed of seas and lakes and built up over time to be compressed into layers of solid rock.
• Limestone, sandstone, coal, and shale are all examples of sedimentary rocks
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Limestone
• Limestone is formed at the bottom of the sea. It is made from the skeletons of small sea creatures, fish, and shells.
• These fall to the bottom of the sea when the animals die. They pile
up over millions of years and the weight compresses the particles into layers of solid rock.
• Chemicals in the sea water also help to cement the particles together into solid rock.
• Limestone is the most common type of rock in Ireland, and can be seen best in the Burren in Co. Clare.
• It is used to make monuments, and in construction of buildings. It
is also used to make cement and to improve soil fertility
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China
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China
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Sandstone
• Sandstone is red/brown in colour.
• It is made when lots of sand is worn away from the earth’s crust. This sand is carried by the wind and rivers.
• They are deposited in the sea or in a desert where the layers build up over time.
• The layers become compressed and cemented together to form sandstone
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Wexford
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Killarney
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Metamorphic Rocks • Metamorphic rocks are made from other rocks that already exist.
The older rocks are changed into new types of rocks because of great heat or pressure.
• Marble, quartzite and slate are examples of metamorphic rocks.
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Quartzite
• Quartzite is an extremely hard rock made mainly from quartz.
• It was made from sandstone which was changed by great heat or pressure.
• It is found on the top of many of Ireland’s mountains such as Croagh Patrick and the Sugarloaf.
• It is used in road chippings, sandpaper, and watches.
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Rio de Janeiro
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Croagh Patrick
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Marble •Marble is formed from limestone.
• It is a very hard rock that can be cut and polished.
• It is found in Connemara and Co. Cork. • It is used to make fireplaces, gravestones, and
ornaments
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Near Clifden
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Italy
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Slate • Slate is made from the sedimentary rock shale.
• It is used to make slates to roof houses and for billiard / snooker tables.
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Cornwall
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Kilkenny
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Valencia Slate mines