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An earthquake is one of the most devastating natural phenomena.
A glacier is a large body of ice in constant, slow motion down a hillside.
It is characterised by dry, hot summers and mild winters.
The oxygen cycle describes the movement of oxygen within its three main reservoirs.
The dissolution of limestone results in the development of karst formations.
Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.
Human activity increases the greenhouse effect and leads to global warming.
Fog is a type of cloud that forms close to the surface of the Earth. There are places on the...