Volcanic activity

This animation demonstrates different types of volcanic eruptions

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The water cycle (basic)

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

Solar radiation

The Sun's rays travel through space without interruption, but once they reach the Earth's...


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The soil

Soil is the loose, uppermost, fertile layer of the Earth’s crust.


Within the lethal embrace of deserts, life can only flourish because of large springs. Here...

The life and development of lakes

Standing water bodies can be formed in depressions on the surface by both internal and external...

Karst region (intermediate)

Karst formations include dolines and dripstones.

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