Here is a sentence that says: In bodies of water polluted by phosphorus, algae can form large floating mats, called algal blooms.

What substance causes an alfal bloom to form? (I don't understand the sentence)

That's "algal bloom"
See:
http://en.wikipedia.org/wiki/Algal_bloom

Similar Questions
  1. Question 22Directions: The diagram below models part of the phosphorus cycle. Use the diagram to answer any questions that
    1. answers icon 1 answer
  2. Question 9Directions: The diagram below models part of the phosphorus cycle. Use the diagram to answer any questions that
    1. answers icon 1 answer
  3. Which is a possible result of red tides?Algae feed off of nutrients from the colder layers of ocean waters. Warmer water
    1. answers icon 5 answers
    1. answers icon 1 answer
more similar questions