Popocatepetl is an active volcano, located in the states of ...
A chemical that is toxic to microrganisms. Biocides are ...
The underground river that flows 13,000ft below ground ...
An instrument for measuring the atmospheric pressure. It ...
The Fukushima Daiichi nuclear disaster is a series of ...
Pasir Panjang (literally, "long sand") beach, or Ngurbloat ...
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