On Wednesday we looked at lots of rocks. Keep looking! When you look at a rock try to decide if it is Igneous, Metamorphic or Sedimentary. If you decide it is Igneous then try to determine if it is entrusive or extrusive. The most common Igneous rocks are Granite and Basalt and they are around you everywhere. Other common rocks are (Sedimentary) limestone, sandstone, (Metamorphic) marble, slate. Our city buildings are often made of rock. Look closely at the walls.