types of rocks

• 3 types of rocks

  igneous

  sedimentary

  metamorphic
• igneous

  • from lava
  • hard, no layers
  • ex. basalt, granite, magma
• sedimentary

  • sediments which were eroded to lower places
  • forms fossils
  • crumbly, layered
  • ex. sandstone, shale, calcite
• metamorphic

  • from other rocks that changed due to immense heat and pressure
  • hard, may not have layers
  • ex. marble, slate