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'''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, bu but they are all hard, stiff and firm. They cannot be bend bent or stretched. ==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 [[Rock 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 [[Rock Grain|grains]] inside.: '''Rock''' formed near [[Volcano|volcanoes]] has lots of [[Rock Crystal|crystals]]. ===Examples==={| class="wikitable"|-|[[File:Limestone.png|center|200px]]|[[File:Mudstone.png|center|200px]]|[[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:Granite.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 [[Rock Crystal|crystals]] rock formed near [[Volcano|volcanoes]].|}