Rivers and landforms

Rivers play an important role in shaping the Earth's surface: they cause erosion as well as carrying and depositing sediment.

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Solar eclipse and lunar eclipse

We can observe quite interesting astronomical phenomena when the Earth, the Sun and the Moon align.

Factors of warming

The duration of solar radiation, the angle of the Sun's rays and the surface albedo all have an...

The desert

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

Lightning

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

Folding (intermediate)

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

Karstification

The dissolution of limestone results in the development of karst formations.

Local winds

The most important types of local winds are the sea-land breeze, the mountain-valley breeze as...

Cloud formation, types of clouds

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

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