Volcano is an opening in Earth’s surface where lava, ash, and gases can escape. It often forms a mountain-like shape around the opening. Some volcanoes are active, while others are not currently erupting. Eruptions can release materials into the air and onto the land.

Volcanoes are found on land and under oceans, often along tectonic plate boundaries. They have formed and erupted throughout Earth’s history. Volcanoes can be found in regions such as the Pacific Ring of Fire. They can affect nearby ecosystems and human populations.