Which of the statements regarding hydroelectric dams is accurate

Which of the following processes in the water cycle is responsible for cloud formation?

Combustion is another word for burning, where oxygen is used, and carbon dioxide is released. 

Which nutrient cycle plays a role in global warming?

Coal acts as a carbon sink.

Look at the diagram below showing a nutrient cycle in an environment. Identify the nutrient cycle.

Which organisms are primarily responsible for removing carbon dioxide from the atmosphere?

Which statement is TRUE about ecosystems?

Steep slopes promote vegetation growth.

What is the main source of energy for most ecosystems on Earth?