Have you ever seen a volcano erupt or have you herd of one? Well if you haven't, I'm going to tell you about them and how they erupt!
Here is how a volcano erupts. A volcano erupts when magma moves up and it comes out as lava througth vents. The gas mixes with the magma. The light, gas-filled magma rises. It moves upward through gaps in rocks around it. It collects in magma chambers are also called hot spots. The magma comes out througt vents or holes in the top and sides of the volcano. It pours out lava.
Here is how a volcano is active. A volcano is active by steam rose from the hot surface and formed clouds. The clouds sheds rain which turned to steam again when it hit the earth. The earth was a very strange place then. Rocks were so hot that they were molten or liquid.
A scientist has discovered a volcano and he was wearing special clothing to protect him from the volcanoes heat. He tested it's temperature so that people may be warned if there is danger of an eruption.
That's how they erupt. Now you know never to go near a volcano even if it doesn't erupt.