t commontype of volcanic cones are stratovolcanoes. A large stratovolcano will be built with manylayers of ash and lava. Mt. Saint Helens, Rainier, and Mt. Fuji are all examples of stratavolcanos.Shield volcanoes are made of thousands of thin lava flows. Because the flow ofthe lava is generally fast, it is able to travel far from the vent. The resulting volcanic landform has a broad base and gentle slopes. Shield volcanoes are the largest volcanoes. Some shield volcanoes, such as Mauna Loa, are amazingly huge at sea level Mauna Loais 60 miles wide, is 30,000 feet from base to summit, and has a volume of roughly 40,000cubic kilometers.In a composite eruption the lava is highly charged with steam and other gases,like carbon dioxide, hydrogen, carbon monoxide, and sulfur dioxide which continuouslyescape which escape from the lava’s surface with violent explosions and rise in a turbidcloud. This cloud discharges showers of rain. Large and small particles of lava are shotupward, forming a fountain like formation of drops and fragments, which are categorizedas bombs, cinders, or ash depending on their size and shape. Lava rises in the vent andeventually spills out of the crater or squeezes, as a mass, out of a fissure on the side of thecone. This is when the crucial or destructive point of an eruption occurs. The volcanomay return to a quiescent state after a final ejection of fragment material. For a period oftime following the eruption of lava or fragment materials, the volcano will give off acidgases and vapor. After this, hot springs may form from the volcano. eventually volcanicheat will disappear, and cool water will issue from the volcano and the ground in it’svicinity.When a volcano becomes inactive it undergoes a reduction in size through erosioncaused by flowing water, glaciers, wind, or waves. The volcano may become totallyruined leaving only a volcanic pipe filled with lava or fragments. The volcanic pipe...
