The formation of fog

Fog is a type of cloud that forms close to the surface of the Earth. There are places on the planet that are shrouded in fog during most of the year.

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Tide

The rise and drop of sea levels caused by the gravitational force of the Moon.

Glacier (basic)

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

The Jovian planets

The four outer planets (Jupiter, Saturn, Neptune and Uranus) do not have solid surfaces, thus...

Plate tectonics

Plate tectonics is a theory dealing with the movement of plates.

Why is seawater salty?

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

Folding (advanced)

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

Living fossils

Learn about animal species that emerged in the distant past and stayed mostly unchanged

The World of the seas

Seas and oceans cover almost three-quarters of the Earth’s surface. 97.5% of the total...

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