Igneous rocks

Igneous rocks

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  • How are igneous rocks formed.
  • Which type intrusive or extrusive?
  • let's start with intrusive.
  • Intrusive rocks are formed by the slow cooling of magma inside earth crust. Granite is an intrusive rock.
  • so what are extrusive igneous rocks like
  • extrusive rocks are formed by the fast cooling of lava unerground
  • how do scientist tell if the rock is intrusive or extrusive
  • but if the crystal shape is smaller than 1mm then that rock is extrusive
  • scientist look at the crystal shape, if the crystals are bigger than 1mm then it is intrusive
  • is igneous the only type of rock?
  • no, there are to other types of rocks sedimentary and metamorphic
  • Do you want to to come with me to the top of this volcano and find some extrusive rocks
  • yeah sure, maybe I will learn more about extrusive igneous rocks
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