• The chemistry of a magma determines the type of igneous rock it forms.
  • The chemistry also determines how the magma moves.
  • The way lava flows depends on what it is made of.
  • The three types of flows are a’a, pahoehoe, and pillow lava.
  • Lavas that cool underwater become pillow lavas.
  • Magmas differ in composition, which affects viscosity.
  • Magma composition has a large effect on how a volcano erupts.
  • The type of eruption a volcano has depends on thetype of magma in its chamber.
Select from the frequently asked questions below