Oxygen cycle

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

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Why is seawater salty?

Water covers about 71% of the Earth’s surface. But why are there two types of water on Earth,...

Seafloor map

The boundaries of tectonic plates can be seen on the seafloor.

Wind at the beach

Sea and land breeze form because of the differing warming of land and sea.

El Niño

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

Topography of the Earth

The animation presents the largest mountains, plains, rivers, lakes and deserts of the Earth.

Folding (intermediate)

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

Climate zones

The Earth is divided into geographical and climatic zones, which result in the zonation...


The last Ice Age ended about 13 thousand years ago.

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