The African savannah

The largest contiguous savannah in the world is in Africa. It covers about one-third of the continent.

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Factors of warming

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Layers of the ocean

Physical properties, as well as the flora and fauna of the ocean change with depth.

El Niño

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

The terrestrial planets

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

Cloud formation, types of clouds

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

Karstification

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

The subtropics

The subtropics are located between the tropical and temperate zones, between 23.5° and 40°...

The soil

Soil is the loose, uppermost, fertile layer of the Earth’s crust.

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