The desert

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

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Eroded fault-block mountains

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

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Rocks are a composed of minerals. These minerals can often be found in their pure forms.

Topography of the Earth

The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.

The rock cycle

Due to the effect of both exogenic and endogenic forces, rocks constantly change. This is called...

Why is seawater salty?

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

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