Underground waters

Groundwater and aquifers are types of underground waters.

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

Folding (basic)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.

Milky Way

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

Eroded fault-block mountains

We can come across the remains of the Variscan and Caledonian mountain systems almost anywhere...

Ozone layer

The ozone layer filters the Sun´s harmful UV radiation, therefore it is indispensable for life...

Altitudinal zonation

In mountainous areas the climate, soil properties, the flora and fauna change depending on...

Carbon cycle

Carbon is bound in organic substances during photosynthesis, while during breathing, it is...

The desert

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

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