Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What three factors affect the rate of decay of biological material?
   • Temperature, water and the availability of oxygen affect the rate of decay.
2. Name two groups of people would want to provide optimum conditions for rapid decay of waste biological material.
   • gardeners and farmers would want to provide optimum conditions for rapid decay of waste biological material.
3. Why would gardeners and farmers want to provide optimum conditions for rapid decay of waste material.
   • gardeners and farmers would want to provide optimum conditions for rapid decay of waste material to provide compost as a natural fertiliser for their soils for growing plants.
4. Under what conditions can decay produce methane that can be used a biogas fuel?
   • Anaerobic condition can produce methane gas. Biogas generators can be used to produce methane gas as a fuel.