3: - A landform (usually a mountain) where liquid rock erupts through the surface of the planet. -A hole in the Earth from which molten rock and gas erupt.
4: Lava is liquid rock (magma) that flows out of a volcano.
5: Magma is liquid rock inside the volcano.
7: There are 1,510 active volcanoes around the world today. The largest active volcano is Mauna Loa, which is located in Hawaii.