Video narration
Have you ever wondered what happens when a mountain throws out melted rock? Like chocolate melting in a warm kitchen, heat turns solid into liquid. Deep inside Earth, some rock melts into magma. As it rises and bursts through an opening, it becomes lava. That's an eruption. Let's travel the world. Italy's Mount Etna is one of Europe's most active volcanoes; Stromboli erupts often. In India's Andaman Sea, Barren Island is home to India's only historically active volcano. Japan's Mount Fuji has a cone-shaped peak, and Hawaii's Mauna Loa is among the world's largest active volcanoes. But volcanoes aren't only mountains. Some are hidden underwater. They can build new land. They can be dangerous, too, yet over time they help make soil rich in nutrients. That mountain is erupting: the melted rock has reached the surface-and that's lava.