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C1a. ­ Products from rocks
2. Rocks and Metals


C1a 2.1 ­ Extracting metals
Metals are found in the Earth's crust.
We find metals combined with other chemical elements,
often oxygen.
This means that the metal must be chemically separated
from its compounds before you can use it.
A metal…

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Cast iron is molten iron that has been left to solidify into
moulds. it contains 96% iron.
Most iron is kept molten to turn into steel.
Steel is made by removing more impurities from the iron.
We then mix it with other elements to change its
properties.

C1a 2.3 ­…

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Copper, gold and aluminium are too soft for many uses.
Copper is a reddish coloured metal. It conducts heat and
electricity very well. People think it was the first metal to
be used by humans. It is a soft metal.
Bronze was probably the first alloy made by humans. It…

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Aluminium and Titanium are useful because they resist
corrosion and are both dense and light.
They are both expensive because extracting them from their
ores involves man stages and it requires a lot of energy.
It is extracted from its ore using electrolysis.
It is important to use recycle these…

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