What is an Algal bloom

An algal bloom or algae bloom is a rapid increase or accumulation in the population of algae in freshwater or marine water systems, and is often recognized by the discoloration in the water from their pigments

Explanation:

An Algae bloom is just a excess of nutrients in water to cause a ton of algae.

Explanation:

Algae feed on nitrogen, phosphates and nutrients, so a lot of those will cause blooms. Algae blooms cause a shortage of nutrients for other sea life and that is why they are bad for the environment. Here's a helpful link if you need it https://sciencing.com/algae-blooms-8266246.html

its i think c because its the lowering cloud