Chem. Atmosphere

• Describe the formation of deposits : coal

  • Wood from trees
  • Flooding caused the wood from dense forests in low-lying wetland areas to be buried in a way that prevented oxidation taking place.
  • Compression + heating over millions of years turned wood into coal.
• • describe and explain the formation of crude oil and natural gas.

  1. Simple plants and tiny animals (plankton) living in oceans
  2. They die
  3. Remains sink to the bottom where they are buried under sedimentary rock.
  4. Lack of oxygen prevents oxidation
  5. Over millions of years, heat + pressure turned the remains into crude oil + natural gas.