What does this mean? We look at why volcanoes exist in the first place, and why some erupt when others don't. Volcanoes are formed when magma (liquid rock) trapped underneath the Earth’s crust ...

A volcano is an opening in the Earth’s crust through which magma, ash and gases escape. A volcano is a hazard caused by plate tectonics. Volcanic eruptions have both primary effects (such as the ...

This was the first time in nearly 40 years that two volcanoes on Hawaii Island erupted simultaneously. Kilauea was also erupting – it is the youngest and southeasternmost volcano on the island ...