Construction metals
Just a quick but detailed mind map pn constuction metals C2b
hope it help guys :)
- Created by: ummamah
- Created on: 15-01-13 20:12
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- Construction metals
- Materials from rocks
- Iron and aluminium are extracted from rocks called ores
- Brick is made by baking clay that has been extracted from the earth
- Glass, concrete and cement are all made from sand (small grains of rock)
- limestone, marble, granite and aggergates are types of rocks extracted form the arth
- limestone is the easiest shape because its the softest.
- Granite is the hardet to shape
- Rocks differ in hardness because of the ways they were made:
- limestone is a sedimentry rock
- Marble is a metamorphic rock, put under pressure so it is harder
- Granite is an igneous rock
- limestone, cement and concrete
- limestone and marble are made form calcium carbonate (mainly) CaCo3
- when calcuim carbonate is heated it breaks down into calcium oxide and CO2
- calcium carboante = calciim oxide + carbon dioxide
- This is a thermal decomposition reaction; one material breaks down in to 2 or more new substances when heated
- clay can be heated together to make cement.
- cement can be mixed with sand, gravel and water to make concrete, which is hard but not very strong
- Impact on the environment
- Rock is dug out of the ground in mines and quarries
- mining and quarying company's have to try and reduce their impact on the environment
- mines and quarries can be very: loud, dusty, take up land, change the landscape and increase the road traffic
- a responsible company will also reconstruct, cover up any area it has worked on
- Materials from rocks
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