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| Soil
Erosion Erosion
is the loss of soil from the land. It is a process that
is always occuring but it can happen faster if we misuse
the land.
The rate of erosion can be
increased by
- removing plant cover
by burning pasture or felling trees, shelter
belts or forests and by having too many animals
on the land
- bad cultivation
practices
- wind
- frost
- rain and water runoff
and
- extreme climatic
effects e.g. Cyclone Bola.
Erosion can be like this.
Erosion can damage roads,
bridges and fences. It can cause pollution of waterways
and destroy stock when it occurs rapidly.
- Find examples of
erosion occuring in your local area.
- Take photographs of
these areas.
- Explain why the
erosion is occuring.
- Find out what people
are doing to:
- prevent
erosion occuring
- reduce the
effects of the erosion that has occured.
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| Erosion
Experiment Equipment: 2 square troughs or cut
down
boxes lined with plastic, a watering can and
a litre milk container.
- Cut a square
of grass to fit into trough 1.
- Fill trough 2
with loose loam or soil.
- Set up each
trough on an angle to
simulate a hill.
- Pour 2L of
water from a watering can
onto each trough just like heavy rain.
- Observe what
happens to each trough.
Did erosion occur?
Why?
- Do the same
experiment with a fan
blowing on the troughs.
- What happens
to the exposed soil?
- Work out
other experiments to show
erosion.
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Contact for Enquiries
Corporate Communications
Level 7, Wellington - ASB House
101-103 The Terrace
PO Box 2526, Wellington
Phone: +64 4 474 4100
Fax: +64 4 474 4244
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