Tornadoes

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

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Atmospheric circulation

The difference between the temperature of the polar and equatorial zones causes...

The Earth’s magnetic field

The Earth’s magnetic North and South poles are located near the geographic North and...

Natural gas and petroleum

Natural gas and petroleum are among the most important sources of energy and raw materials today.

The process of physical and chemical weathering

Upon physical weathering the rock only falls into pieces, whereas during chemical weathering its...

The African savannah

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

Snow line

Above a certain altitude snow does not melt, not even in summer.

Carbon cycle

Carbon is bound in organic substances during photosynthesis, while during breathing, it...

Factors of warming

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

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