Volcanoes
Volcanoes can be very dangerous. When they explode they can do a lot of damage. They are mountains that became volcanoes when they exploded and the lava poured out. The temperature of the lava is up to 2000 degrees Fahrenheit . The reason that they are so dangerous is because of the lava it is so hot that it will burn through houses and buildings. Lava moves slow so people have enough time to get out of the way but it still kills people and animals. The problem is that it burn everything in its way. The reason they erupt is the earths plates move over each other which creates a lot of heat. This heat melts the rocks in to liquid that rises to the surface of the earth.
References
http://www.sveurop.org/gb/articles/articles/volchazards2.htm http://kids.discovery.com/tell-me/curiosity-corner/earth/natural-disasters/why-do-volcanoes-erupt