Antarctica is dotted with volcanoes, waiting to erupt. And a volcano in Tanzania and volcanoes in Iceland are close to erupting. The Tonga eruption, which released 150 megatons of water vapor into the stratosphere, affected the atmosphere for years. Satellite data suggests that a volcano in Tanzania, which spews extremely fluid lava, may be close to erupting. Iceland is threatened by uncontrolled volcanic eruptions due to climate change.