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Underground waters

Groundwater and aquifers are types of underground waters.

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Cloud formation, types of clouds

Evaporating surface water forms clouds of various shapes from which water falls back to...

The desert

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

The terrestrial planets

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

Natural gas and petroleum

Natural gas and petroleum are among the most important sources of energy and raw materials today.

Rivers and landforms

Rivers play an important role in shaping the Earth's surface: they cause erosion as well...

The weather forecast

The weather can be forecast with different meteorological instruments.

The Tundra: a green-edged icy wasteland

Is the tundra region as cold and deserted as many people think?


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