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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Glaciation

The last Ice Age ended about 13 thousand years ago.

Factors of warming

The duration of solar radiation, the angle of the Sun's rays and the surface albedo all have an...

Polluting natural waters

Water is one of our key natural resources; we must protect it vigorously.

Faulting (basic)

Vertical forces can break up layers of rock into fault blocks, which then move vertically...

Glacier (basic)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.

Seafloor map

The boundaries of tectonic plates can be seen on the seafloor.

How lakes disappear

On a geological time scale lakes are short-lived.

The terrestrial planets

Mercury, Venus, Earth and Mars may have they formed in much the same way, but only the Earth is...

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