Rocks

• Minerals


  A mineral is a natural substance with a crystal structure.
• Igneous Rock


  Form from the cooling and solidification of molten material, either magma (underground) or lava (above ground). E.g. Granite, basalt.
• Types of Igneous Rocks 


  Intrusive Igneous Rock - Forms beneath the earths surface from magma cooling. Much larger crystals can form. Often course grained.

  Extrusive Igneous Rock - Forms above the earths surface from lava cooling. Minimal crystal growth. Fine grained pr glassy.
• Sedimentary Rocks


  Formed from the accumulation and compression of sediments. E.g. Sandstone, Lime stone and Shale.
• Metamorphic Rocks


  Formed from pre-existing rocks that have undergone changes to heat and/or pressure. E.g.Marble, PhylliFormed from pre-existing rocks that have undergone changes to heat and/or pressure. E.g.Marble