Approximately what percentage of Earth's surface is covered by water?

Which water reservoir contains the most water?

Water often is described as the universal solvent. What does that mean?

How will a layer of cold water and a layer of warm water settle in a container?

Which describes water molecules being attracted to other polar molecules?

What agency is responsible for enforcing water pollution laws in the US?

Which term means looking after a body of water and helping to keep it clean?

What would happen to consumers if all producers perished?

Which are organisms that break down tissue and release nutrients and carbon dioxide back into the ecosystems?

Which is a producer?

Why are estuaries an important habitat for many marine organisms?

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