Answer the following question given this paragraph: 

When fertilizer ends up in bodies of water, the added nutrients cause excessive growth of algae. This is called an algal bloom. You can see one in Figure below . The algae out-compete other water organisms. They may make the water unfit for human consumption or recreation.


Q: When fertilizer ends up in bodies of water, the added nutrients cause excessive growth referred to as what, which can render the water unfit for human consumption or recreation?


A:
algal bloom