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There are [blank_start]3[blank_end] types of rock
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Igneous rocks are formed by [blank_start]magma[blank_end] (melted underground rock) which is pushed up to the [blank_start]crust[blank_end] and often out [blank_start]volcanoes[blank_end]
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Igneous rocks contain various [blank_start]minerals[blank_end] in randomly arranged [blank_start]interlocking crystals[blank_end]. The [blank_start]size[blank_end] and [blank_start]texture[blank_end] of the crystals depend on speed of cooling
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minerals
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interlocking crystals
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size
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texture
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There are 2 types of igenous rock- [blank_start]extrusive[blank_end] and [blank_start]intrusive[blank_end]
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Extrusive igneous rocks cool [blank_start]quickly[blank_end] [blank_start]above[blank_end] ground
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Intrusive igneous rocks cool [blank_start]slowly[blank_end] [blank_start]below[blank_end] ground
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Igneous rocks don't form [blank_start]fossils[blank_end] as any [blank_start]fossils[blank_end] wil have melted to form [blank_start]magma[blank_end] in the original rock
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Sedimentary rocks are formed by layers of [blank_start]sediment[blank_end], which are [blank_start]rock fragments[blank_end] that are deposited
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To form sedimentary rocks, over time the [blank_start]layers[blank_end] are [blank_start]cemented[blank_end] together by [blank_start]minerals[blank_end] that act as glue
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To form sedimentary rocks, the weight of the [blank_start]sediments[blank_end] on top squashes the [blank_start]sediments[blank_end] at the botoom. This is called [blank_start]compaction[blank_end]
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sediments
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sediments
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compaction
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[blank_start]Fossils[blank_end] can form in the sediments. this is the long dead remains of animals and plants
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Metamorphic rocks are made by the result of [blank_start]heat[blank_end] and [blank_start]increased[blank_end] pressure acting on existing [blank_start]rocks[blank_end] over a [blank_start]long[blank_end] period of time
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heat
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increased
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rocks
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long
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Metamorphic rocks may have tiny [blank_start]crystals[blank_end] and some have [blank_start]layers[blank_end]
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Metamorphic rocks are always made from [blank_start]interlocking[blank_end] crystals
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Metamorphic rocks usually have different properties to the [blank_start]rocks[blank_end] from which [blank_start]they were made from[blank_end]
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rocks
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they were made from
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Metamorphic rocks are never made from [blank_start]molten[blank_end] rock
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Metamorphic rocks rarely contain [blank_start]fossils[blank_end]. The don't normally usrvive the [blank_start]heat[blank_end] and [blank_start]pressure[blank_end]
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Metamorphic rocks can be heated up by the movement of [blank_start]tectonic plates[blank_end] or [blank_start]magma[blank_end]
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The higher temperature and pressure of rock when formed, the crystal size [blank_start]increase[blank_end] and the thickness of layers [blank_start]increase[blank_end]