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Title: Human activity and environment
Description: These notes about the human activity and environment have helped me gain alot of marks in the test so I hope it helps you aswell
Description: These notes about the human activity and environment have helped me gain alot of marks in the test so I hope it helps you aswell
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"uman Activity and the Environment
...
eek!
It's also due to modern farming methods which can
provide more food, needed for so many more hungry
mouths
...
Infroduction
of modern
medicine end
farming
Year
1000
1400
1600
2000
As the human population increases:
•
Raw materials, including non-renewable energy resources, are rapidly being used up,
•
More and more waste and rubbish are being produced,
•
More pollutants are being produced like phosphates from detergents, nitrates from fertilisers and
sulphur dioxide from coal burning power stations
...
Fertilisers are chemicals containing nitrates and phosphates, which are necessary for modern farming
...
This is because the crops
take nitrates out of the soil and these nitrates must be replaced
...
Problems with Fertilisers
...
This causes the natural concentration of nitrates and phosphates to increase
...
1
...
2
...
Some plants below the algae
layer and algae in the bottom parts of the layer
start dying, due to competition for light,
and stop producing oxygen through
photosynthesis
...
Oxygen levels in the water decrease
...
Microbes that feed on the dead remains of the
plants and rapidly increase in numbers and
use up more oxygen from the water in their
respiration
...
Oxygen concentrations in the water decrease
further, so fish and aquatic animals suffocate,
due to lack of oxygen, and die
Title: Human activity and environment
Description: These notes about the human activity and environment have helped me gain alot of marks in the test so I hope it helps you aswell
Description: These notes about the human activity and environment have helped me gain alot of marks in the test so I hope it helps you aswell