Limestone

It is a sedimentary rock with high calcium carbonate content.

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Tsunami

Tsunami waves are very high waves of immense destructive power.

Folding (advanced)

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

Lightning

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

Coal formation

This video presents the different stages of coal formation.

Aeolian landforms in deserts

Wind, as an external force, plays an important role in shaping deserts.

Volcanic activity

The area surrounding an inactive or extinct volcano is not necessarily calm. Let’s see the...

Natural gas and petroleum

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

The desert

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

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