Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.

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

Karst region (basic)

Karst formations include dolines and dripstones.

The water cycle (intermediate)

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Living fossils

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

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Groundwater and aquifers are types of underground waters.

The terrestrial planets

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