Greenhouse effect

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

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Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100...

The African savannah

The largest contiguous savannah in the world is in Africa. It covers about one-third of the...

Polluting natural waters

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

The work of glaciers

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

Aeolian landforms on coasts and steppes

Wind, as an external force, plays an important role in shaping coastal areas and steppes.

Tectonic plates

Tectonic plates can move in relation to each other.

Minerals: active participants of our lives

This lesson introduces you to the world of minerals.

Karst region (basic)

Karst formations include dolines and dripstones.

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