Supervolcanoes.Toba Lake,Yellowstone Caldera

Supervolcanoes.Toba Lake,Yellowstone Caldera,Long Valley and Taupo Lake. The large supervolcanoes around the world such as Lake Toba,Northwestern Sumatra Island,Indonesia;the world famous Yellowstone Caldera,Wyoming,USA;Long Valley,California,USA and Taupo Lake at the North Island,New Zealand.
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