Snow line

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

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The circumference of the Earth has already been calculated in ancient Egypt. The calculations...


It is a sedimentary rock made up of loosely structured, rough grains of rock.

How do seas shape the Earth's surface?

Seawater, as an external force, plays an important role in shaping coastlines.

Glacier (intermediate)

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

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.


Waterfalls form where the river flows over a steep precipice in its course.

Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

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