In some lakes, excessive blooms of algae appear when human activity causes degradation of water quality resulting in conditions more favorable for algae growth. Which human activity primarily causes this problem?

How do toxic heavy metals move from soil to lakes and streams?

What is a common consequence of using disposable containers?

What is a potential environmental impact of shipping?

What is a common method to prevent soil erosion on agricultural land?

Marine dead zones can form when nutrient run-off causes certain types of algae to grow very quickly and then die off. As dead algae decompose, oxygen is removed from the water. With less oxygen available, fish and other marine animals can die. What would be one practical way to reduce marine dead zones?

The development of a nuclear power plant at an ocean site is expected to produce an enormous amount of electric power for a large population. Ocean water will be used to cool the plant and then the warm water will be returned to the ocean. What unintended consequences should be analyzed before starting construction?

Fertilizer from an agricultural area runs off into a river. The river carries the nutrients from this fertilizer and deposits them into an ocean bay creating an algae bloom. How can farmers reduce this negative impact on the ocean?

City officials want a new drinking water facility. Which location would have the highest concentration of chemical runoff caused by human activity?

What is one positive way humans activities can help manage and protect ocean systems?

Coral reefs are endangered by

When filtering out pollution, which substance will help slow water movement down and catch a larger amount of pollutants?