Why is seawater salty?

Water covers about 71% of the Earth’s surface. But why are there two types of water on Earth, fresh and salt water?

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Water on Earth is in a continuous state of change. The water cycle includes processes...

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On a geological time scale lakes are short-lived.

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most...

Exogenic forces

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Layers of the ocean

Physical properties, as well as the flora and fauna of the ocean change with depth.

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