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Description
Flashcards by Ella Maggs, updated more than 1 year ago
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Created by Ella Maggs
about 8 years ago
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| Question | Answer |
| Step 1 | Fertilisers are washed off fields, and into ponds, lakes and rivers. |
| Step 2 | The fertilisers in the water increase the nitrate and phosphate levels in the water. |
| Step 3 | Algae now goes quickly on the surface of the water due to the presence of theses chemicals. |
| Step 4 | The algae blocks of the sunlight to other plants, so they now die. |
| Step 5 | Aerobic bacteria use up all the oxygen in the water and feed on the dead plants. Most living organisms die. |
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