• The appearance of the rock is created by the composition of the magma.
  • The size of the crystals creates the texture of theRock.
  • The most common extrusive igneous rock is basalt.
  • It is the rock that makes up the ocean floor.
  • The rapid cooling time does not allow time for large crystals to form.
  • So igneous extrusive rocks have smaller crystals than igneous intrusive rocks.
  • Extrusive.
  • igneous rocks are also called volcanic rocks.
  • They cool from magma slowly in the crust.
  • They have large crystals.
Select from the frequently asked questions below