poas volcano slideshow
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Poas VolcanoRosalinda Hernandez
Poas is currently active
There are known 39 pronounced eruptions since 1828.
The volcano’s main crater contains one of the most acidic lakes in the world!
Laguna Caliente
Laguna Caliente often has a PH of 0! The bottom of this lake contains liquid sulfur.
The diversity of colors of the lake is fascinating. It might be emerald green then hours later grey-whitish. Sometimes rafts of brilliant, yellow sulfur are seen floating in the lake.