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El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

The phosphorus cycle

The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

Geothermal power station

Geothermal power stations convert energy of hot, high-pressure water found in deeper layers of the Earth into electricity.

Geyser

A geyser is a spring characterised by intermittent discharge of water and steam.

Fjord

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

Local winds

The most important types of local winds are the sea-land breeze, the mountain-valley breeze as well as the downslope winds.

Tropical cyclones

Cyclones are large air masses with winds spiralling inwards around a low-pressure centre, and carry clouds and precipitation.

Faulting (basic)

Vertical forces can break up layers of rock into fault blocks, which then move vertically along the fracture planes.

The water cycle (basic)

Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.

Glacier (basic)

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

Folding (basic)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.

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