Potable water refers to water that is 'drinkable' and will ...
Mayon Volcano is an active volcano in the province of ...
Mount Pinatubo is an active stratovolcano located on the ...
Almolonga volcano is an andesitic stratovolcano in the ...
Lake Vostok is the largest of more than 140 subglacial ...
A whitish semicircular arc seen opposite the sun in fog. ...
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