Mount Etna is an active stratovolcano on the east coast of ...
A chemical that is toxic to microrganisms. Biocides are ...
Piton de la Fournaise is a shield volcano on the eastern ...
Rising unexpectedly from the heart of the Namib Desert in ...
The underground river that flows 13,000ft below ground ...
The San Salvador Volcano is a stratovolcano situated ...
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