Weather fronts

When masses of cold and warm air meet, weather fronts develop.

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

Glacier (basic)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.

Underground waters

Groundwater and aquifers are types of underground waters.

The Tundra: a green-edged icy wasteland

Is the tundra region as cold and deserted as many people think?

The subtropics

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


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


A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial...

Cloud formation, types of clouds

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

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