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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The Jovian planets

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

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

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

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