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Rock
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==Key Stage 2==
===Meaning===
'''Rock''' is a hard, stiff and firm material made of [[Rock Crystal|crystals]] or [[Rock Grain|grains]].
===About Rock===
: '''Rock''' is made from [[grainRock Grain|grains]] which are tiny pieces of rock that are stuck together.: Some '''rocks''' have [[Rock Crystal|crystals]] inside them which are grains that have sharp edges. You can often see [[Rock Crystal|crystals ]] because they are shiny and sparkle like glitter.: The shape of [[Rock Grain|grains]] in the '''rock''' depends on how it was formed.: The size of [[Rock Crystal|crystals]] also depends on how the '''rock''' formed.: '''Rock''' formed at the bottom of a lake or the sea has rounded [[grainRock Grain|grains]] inside.: '''Rock''' formed near [[Volcano|volcanoes]] has lots of [[Rock Crystal|crystals]].
===Examples===
|[[File:Sandstone.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |This limestone has lots of rounded [[Rock Grain|grains ]] and was formed at the bottom of the ocean.| style="height:20px; width:200px; text-align:center;" |This mudstone formed at the bottom a lake and has rounded [[Rock Grain|grains]].| style="height:20px; width:200px; text-align:center;" |Sandstone is made of rounded [[Rock Grain|grains ]] of sand stuck together.
|-
|[[File:Basalt.png|center|200px]]
|[[File:Quartz.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |This basalt has lost of very small [[Rock Crystal|crystals ]] inside it and formed form a [[volcano]].| style="height:20px; width:200px; text-align:center;" |Granite formed from [[magma ]] stuck underground near a [[volcano ]] and has [[Rock Crystal|crystals ]] inside it.| style="height:20px; width:200px; text-align:center;" |Quartz is a very large crystal [[Rock Crystal|crystals]] rock formed near [[Volcano|volcanoes]].
|}