Mountains like Vesuvius and Mt. St. Helens have lava that has a high water/high silica content. This is a deadly combination for as the lava oozes to the surface, the gases in it quickly form bubbles that turn the lava into a red hot froth that explodes out of the ground in a searing grey cloud. There is also another lava that has a low water/low silica content. This is a very runny lava that spreads far and wide and runs long distances before cooling. This sometimes results in creating new  shield volcanos. Another lava, unlike the other ones, has a low water/ high silica content. This lava is very pasty and has a high viscocity which means it's very thick and slow. The lava slowly oozes out to form a bulbous dome that hardly moves at all. After a while it may form tall steep stratos volcanoes. The last lava has a high water/ low silica content. This lava bubbles and froths alot and sometimes comes out as a fire fountain over the vent. What also happens is that the vent spits out tiny cinders and large "bombs" of lava that cool very quickly. That's what I have for lava! Now it's time for volcanoes!

            Mt. St. Helens is a Composite volcano. These volcanos are typically tens of miles across. and ten thousand or more feet in height. they have moderately steep sides and sometimes have small craters in their summits. They consist of layers of solid lava flows mixed with layers of sand or gravel-like volcanic rock called cinders or volcanic ash. Another type of volcano is the Cinder Cone volcano. Cinder Cone volcanoes consist of loose grainy cinders and almost no lava. They are only a mile across and up to a thousand feet high. They have steep sides and usually have a small crater on top. A different type of volcano is the Shield volcano. They can be hundreds of miles across and many tens of thousands of feet high. They consist almost entirely of frozen lavas. They almost always have large craters at their summits. The Caldera volcano is very wide and isn't tall at all. They are up to tens of miles across and look like big craters. They can spew rock hundreds, and maybe even thousands of miles in all directions. Finally, last but not least, the Fissure Volcano! These volcanos are really just giant cracks in the ground. The giant cracks expel vast quanities of lava that spread far and wide to form huge pools that can cover almost anything around it. When the lava cools, the surface is completely flat. And that is My AMAZING Volcano/Lava Project.