igneous rocks

igneous rocks
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  • do you know how a igneous rock forms 
  • no
  • you have intrusive and extrusive  they are the two different forms of igneous rocks
  • how does an intrusive rock form 
  • intrusive rocks form inside a volcano which is called magma
  • anything else
  • yes it cools very slowly it also has large crystals which are coarse-grained a example is granite
  • that is so fascinating now how does a extrusive rock form 
  •  extrusive rocks form outside or near the Earths surface and it also is lava which will cool fast
  • wow can you tell me more 
  • it  also has small or no crystals at all which would be fine-grained
  • do you know any of the exampels
  • yes one is Pumice it has air bubbles so it is vesicular Basalt is another one but with low silica and the last one is 0bsidian
  • good job
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