Short-lived but extremely powerful tornadoes can cause a great deal of damage.

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It is a sedimentary rock made up of loosely structured, rough grains of rock.

El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

The desert

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


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

The work of glaciers

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

The weather forecast

The weather can be forecast with different meteorological instruments.

Karst region (intermediate)

Karst formations include dolines and dripstones.

Folding (basic)

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

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