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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Lightning

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

Tornadoes

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

Tide

The rise and drop of sea levels caused by the gravitational force of the Moon.

Geyser

A geyser is a spring characterised by intermittent discharge of water and steam.

Folding (advanced)

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

Nitrogen cycle

Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of...

Eratosthenes

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

Karstification

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

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