Waves play an important role in forming the coast.

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Waterfalls form where the river flows over a steep precipice in its course.


Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.

The weather forecast

The weather can be forecast with different meteorological instruments.

How lakes disappear

On a geological time scale lakes are short-lived.

Plate tectonics

Plate tectonics is a theory dealing with the movement of plates.

The desert

One third of the continents is covered with desert. Today, desertification is a growing problem.

Wind at the beach

Sea and land breeze form because of the differing warming of land and sea.

Underground waters

Groundwater and aquifers are types of underground waters.

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