Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.

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Faulting (intermediate)

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


Rocks are a composed of minerals. These minerals can often be found in their pure forms.

Glacier (basic)

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

Coal formation

This video presents the different stages of coal formation.

The water cycle (basic)

Water on Earth is in a continuous state of change. The water cycle includes processes such as...

Snow line

Above a certain altitude snow does not melt, not even in summer.

Layers of the ocean

Physical properties, as well as the flora and fauna of the ocean change with depth.


It is a sedimentary rock made up of loosely structured, rough grains of rock.

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