1 What does a volcano look like? 2 What is at the top of the volcano? 3 What happens to the very hot, red material when a volcano erupts? How many active volcanoes are there 4 How many active volcanoes are there?​

1 A volcano usually looks like a mountain with an open crater at the top. 2 At the top of the volcano is a crater, which is the opening from which molten rock, ash and gas are released. 3 When a volcano erupts, the very hot, red material is ejected out of the crater and can travel downwards in the form of lava or flow away from the side of the volcano in a pyroclastic flow. 4 There are approximately 1,500 active volcanoes around the world.