Lightning

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

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The development of lakes

Standing bodies of water can form in depressions on the surface by both endogenic and...

Factors of warming

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

El Niño

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

Karst region (basic)

Karst formations include dolines and dripstones.

The water cycle (intermediate)

Water on Earth is in a continuous state of change. The water cycle includes processes...

Living fossils

Learn about animal species that emerged in the distant past and stayed mostly unchanged

Underground waters

Groundwater and aquifers are types of underground waters.

The terrestrial planets

Mercury, Venus, Earth and Mars may have they formed in much the same way, but only the Earth is...

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