Science 4th grade | UNIT 2: Living things and environment 2.8 Recycling can save the earth!
Humans make a lot of waste. We throw away clothes that could be reused. A lot of waste is buried. This pollutes the soil and the ground water. Some materials can be recycled so that they don't have to be buried.
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Gardeners and farmers recycle plant material by making compost heaps. They pile up dead plant material.
Micro-organisms use the dead plant material as food. This is what we call rotting.
As the plant material rots, it turns into compost. Compost helps plants to grow when it is added to soil.
Activity 2.8a (Making a mini compost heap)
You will need: plastic gloves - leaves - plant stems - an apple core - a plastic bag or jar with a lid
Gather some plant materials. Put them in a plastic bag or jar. Add a little water. Close the bag or jar. Micro-organisms will begin to eat the plant material. Observe the changes over a number of days. Record your observations.
Activity 2.8a (Making a mini compost heap)
You will need: plastic gloves - leaves - plant stems - an apple core - a plastic bag or jar with a lid
Gather some plant materials. Put them in a plastic bag or jar. Add a little water. Close the bag or jar. Micro-organisms will begin to eat the plant material. Observe the changes over a number of days. Record your observations.
Questions
1) Why should we make compost heaps?
2) Why is it important to recycle materials?