The work of glaciers

A glacier is a large body of ice in constant, slow motion down a hillside.

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Eratosthenes

The circumference of the Earth has already been calculated in ancient Egypt. The calculations...

Glaciation

The last Ice Age ended about 13 thousand years ago.

Oasis

Within the lethal embrace of deserts, life can only flourish because of large springs. Here...

Polluting natural waters

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

Greenhouse effect

Human activity increases the greenhouse effect and leads to global warming.

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

The Jovian planets

The four outer planets (Jupiter, Saturn, Neptune and Uranus) do not have solid surfaces, thus...

Limestone

It is a sedimentary rock with high calcium carbonate content.

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