Volcano's lake changes from blue to red
Scientists with New Zealand's Geology and Mines Department are puzzled over the change and are conducting tests to see what caused the transformation.
Mount Karthala on Comoros Island is shown bubbling lava on May 29. Reuters photo from Yahoo News.
The leading hypthoses now is that something flowing into the lake is causing a chemical reaction, or gas from the volcano is creating the change.
Three other volcanoes in Vanuatu have been acting up in recent weeks.
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