Soil Formation & Classification: Rock Types

Soil Formation & Classification: Rock Types

1. Igneous

   • Magma cools and solidifies
   • Crystals
     • Quartz
       • Acidic
       • Granite
     • Feldspar
       • Alkaline
       • Basalt
     • Mica

2. Sedimentary

   • Layers of sediment deposit in seas and lakes, compact and solidify
   • Characteristics
     • Sand (quartz)
       • Rock formed = sandstone
       • Acidic
     • Clay
       • Rock formed = shale
       • Less acidic
     • Fossils & shells
       • Rock formed = limestone
         • Alkaline

3. Metamorphic