Geography

woo got 100%, would be good if you added some more questions!

The questions were simple but effective. They were all based on one topic too which was helpful :)

And i got 100% too!

A lack of oxygen in the water doesn't cause eutrophication! An example would be ammonia 'running off' fields into rivers and local water supplies which can lead to excessive plant growth. The plants will then use up a majority of the oxygen in the water leaving little for other resperating organism and causing these organisms to die (e.g fish). That is the cause and lack of oxygen is only a by-product!