Rivers and landforms

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

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

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

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

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

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

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

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