Volcanoes form as the magma rises through the Earth's crust. The Kilauea volcano in Hawaii’s Volcanoes National Park has been sporadically erupting since December. Lava erupted from the volcano’s top ...

What we see as Isle Royale and the Keweenaw Peninsula is actually part of the one of the largest known lava flows on Earth. A map of the different forms of rock found throughout the Greenstone Flow.

The Big Island is home to one of the most lively volcanoes on Earth. And you can see why.