Tsunami

Tsunami waves are very high waves of immense destructive power.

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Faulting (intermediate)

Vertical forces can break up layers of rock into fault blocks, which then move vertically along...

Eratosthenes

The circumference of the Earth has already been calculated in ancient Egypt. The calculations...

Natural gas and petroleum

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

Minerals

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

Glacier (basic)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.

Cloud formation, types of clouds

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

Ozone layer

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

Tropical cyclones

Cyclones are large areas of swirling air with clouds and precipitation being formed inside.

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