Volcanic activity

The area surrounding an inactive or extinct volcano is not necessarily calm. Let’s see the potential after-effects of once active volcanoes.

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

Folding (intermediate)

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

Glacier (basic)

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

The work of glaciers

A glacier is a large body of ice in constant, slow motion down a hillside.


Tsunami waves are very high waves of immense destructive power.

The desert

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


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

Seafloor map

The boundaries of tectonic plates can be seen on the seafloor.

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