How lakes disappear

On a geological time scale lakes are short-lived.

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

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

The Jovian planets

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

The water cycle (intermediate)

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Seafloor map

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


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.

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