The terrestrial planets

Mercury, Venus, Earth and Mars may have they formed in much the same way, but only the Earth is lucky enough to be in the habitable zone.

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Watercourses

People have always preferred to settle near rivers. What are the advantages and disadvantages of...

Wind at the beach

Sea and land breeze form because of the differing warming of land and sea.

The African savannah

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

Nitrogen cycle

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

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most...

Ocean currents

The Great ocean conveyor is a planet-wide system of ocean currents, which has a great...

Tsunami

Tsunami waves are very high waves of immense destructive power.

Minerals

Rocks are a composed of minerals. These minerals can often be found in their pure forms.

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