Acid rain is a product of pollution. It forms when gases, like sulfur dioxide, dissolve into rain water. What human activities release these gases?
Which of the following statements correctly links pollution and biodiversity?
The passage below gives a brief description of the process of eutrophication:
A fertilizer is added to the fields and is washed off by heavy rain. This fertilizer runs into rivers and streams where the excess nutrients cause algae to grow rapidly. The algae cover the surface of the water and block sunlight from reaching the plants below the surface. These plants can no longer , and so they do not produce oxygen. The fish and other aquatic organisms that need oxygen to now die.
What word should replace the first blank?
What word should replace the second blank?