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Chapter 2 - Geog

Rocks

TermDefinition
The 3 types of rocks are 1. Igneous rocks(Fire rocks) 2. Sedimentary rocks(sea rocks) 3. Metamorphic rocks(changed rocks)
Igneous Rocks (fire rocks) are formed Igneous rocks are formed from volcanoes when hot magma or lava inside or on the earth surface cools and hardens.
Sedimentary Rocks (sea rocks) are formed Sedimentary rocks are formed at the bottom of the sea when the remains of animals, plants and other rocks are compressed(push together) or glued together to form a rock.
Metamorphic rocks (changed rocks) are formed Metamorphic rocks were once igneous or sedimentary rock but have been changed because of great pressure or heat.
2 types of Igneous rocks (fire rocks) are 1. Basalt 2. Granite
2 types of Sedimentary (sea rocks) are 1. Limestone 2. Sandstone
2 types of Metamorphic rocks (changed rocks) are 1. Marble 2. Quartzite
Granite is made When magma cools slowly under the earth's surface.Over millions of years the layers of rock above the granite are worn away, leaving the granite exposed at the surface. It is a very hard rock and used in buildings.
Basalt is made when lava cools and hardens on the earth’s surface.It is dark in colour and used in building materials and road chippings. Example of Basalt in Ireland is the Giant’s Causeway.
Limestone is made at the bottom of the sea when the skeletons of small sea creatures pile up over millions of years and the weight compresses the particles into layers of solid rock.Limestone is the most common type of rock in Ireland and found in the Burren
Sandstone is made It is made when lots of sand is worn away from the earth’s crust. This sand is left at the bottom of the sea where layers build up over time. The layers become compressed and cemented together to form sandstone. Used as a paving stone.
Marble is made 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
Quartzite is made Quartzite is an extremely hard rock 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.
Uses of Rocks 1. Buildings 2. Monuments 3. Road Chippings 4. Fireplaces 5. Counter tops 6. Gravestones
Created by: toastiee1
 

 



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