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Rock
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===About Rock===
'''Rock''' is used to make buildings because it is very hard and strong. There are many different kinds of '''rock'''. Some are shiny, others are dull. Some are smooth and other are rough, but they are all hard, stiff and firm. They cannot be bent or stretched.
==Key Stage 2==
===Meaning===
'''Rock''' is a hard, stiff and firm material made of [[Crystal|crystals]] or [[Grain|grains]].
===About Rock===
: Some '''rocks''' are made of [[grain|grains]] which are tiny pieces of rock with rounded edges that are stuck together.
: Some '''rocks''' have [[Crystal|crystals]] inside them which are small shiny pieces of rock with sharp edges that are stuck together.
: Whether '''rock''' is made from [[Grain|grains]] or [[Crystal|crystals]] depends on how the rock formed.
: '''Rock''' formed at the bottom of a lake or the sea has [[grain|grains]] inside it while '''rock''' formed near [[Volcano|volcanoes]] has crystals.
===Examples===
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