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A geyser is a spring characterised by intermittent discharge of water and steam.
It is a sedimentary rock made up of loosely structured, rough grains of rock.
The circumference of the Earth has already been calculated in ancient Egypt. The calculations...
A glacier is a large body of ice in constant, slow motion down a hillside.
The largest contiguous savannah in the world is in Africa. It covers about one-third of the...
An earthquake is one of the most devastating natural phenomena.
Plate tectonics is a theory dealing with the movement of plates.
Wind, as an external force, plays an important role in shaping deserts.