Saturday, July 21, 2007
LAND POLLUTION!
-is the adding of substance(pollutants) which have harmful or unpleasnant effects into the enviroment
-the pollutants have damaging effects on people, animals, plants, buildings or machines
-pollution may be due to natural or human activities
How land is polluted?
-a large amount of waste is produced everyday
-excessive amount of waste pollutes the land
-land is also polluted when waste is not disposed of properly
-sometime wasre is disposed on roadsides as litter
-at other times, it is left in great heaps at public places not designated as rubbish dumps
-a lot of time and effort is required to clean the land
-improper disposal of waste occurs on mining sites where heaps of waste materials are left behind after the minerals have been extracted
PESTICIDES AND HERBICIDES
-pesticides are used by farmers to kill insects and other animals that may eat their crops or spread diseases
-herbicides are used to kill weeds that compete with the crops for water and nutrient in the soil
-unfortunately, pesticides and herbicides can pollute the land when they are washed into the soil
EFFECTS OF LAND POLLUTION
-negative effect on public health
- waste that is carelessly thrown away can be smelly, unhygenic or even dangerous
- attract pests such as flies and rats
-poisoning of plants and animals
- pesticides and herbicides are toxic
- they may be washed into the soil and consume by the earthworms
- the earthworms accumulate toxic and chemical in their body
- when they are eaten by bigger animals, the chemical pass to the predators, causing side effects
-Soil contamination
- it can affects plant growth
- groundwater, rivers and streams can be affected
- chemical may seep into groundwater and pollutes it.
samantha
Labels: Environment
Y 07S10-GRP02
9:21 pm
