Flashcards in Fresh Water Pollution (T4) Deck (3):
What are the three main pollutants of fresh water?
- nitrates from fertilisers
- organic waste
What is eutrophication and what can cause it?
Eutrophication is an increase in mineral ions in lakes and rivers which can occur naturally but also artificially as follows:
- farmers often add inorganic fertilisers to their crops to replace the minerals lost when crops are removed
- the nitrates in these fertilisers are very soluble and so are easily leached from the soils and can enter waterways
- the levels of nitrates and ions can rise rapidly in lakes and rivers which are affected, causing the increase in mineral ions known as eutrophication