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What is the difference between a pond and a pond?

Why is sea water blue?

Why is the Saône not a river?

What are the 5 countries bordering the Great Lakes?

What if sea water wasn’t salty?

What is the name for the beginning of a river?

What do you call water that doesn’t flow?

Why are there no fish in Lake Annecy?

Which country has the best water quality in Europe?

Can a pond be too deep?

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