volcono

Volcanoes are really mountains that build taller and taller, with time, as they erupt. That means that molten rock, magma, comes from within the earth and erupts onto the surface. The volcano might be explosive and produce ashes or be effusive and produce lava. The explosions are usually first because there are lots of gases inside the magma. When you have a bottle of soda pop, you do not see any bubbles of gas, but when you open it, bubbles form almost instantly. Once the gas bubbles have all escaped, the soda is flat. Once the magma is flat, a lava flow comes out. Most of the volcanoes from around the Pacific Ocean are composite, which means that there are layers of ashes and lava. Most volcanoes are 10,000 to 100,000 years old — it takes time for them to grow big.

Volcanoes can be very destructive. Some are more destructive than others though. In Hawaii, the local volcano is so placid that it's eruption doesn't cause much disturbance at all. There are often tourists crawling on it. On the other hand, there are super volcanoes that literally could destroy civilization and man kind. One such super volcano is living under the entire of the national park of Yellowstone. In between is where most volcanoes rest, one example is Mt. St. Hellens.