| Cinder cone volcanoes are another major type of volcano. Cinder cones are also known as volcanic cones or scoria cones. These volcanoes are formed by fast cooling lava that cools quickly, causing a steep hill leading to the vent. Cinder cones can be standalone, or they can even be found on the sides of other volcanoes, such as shield volcanoes. The eruptions of such volcanoes are usually from the sides of the inner crater or on the outside flanks of the volcanic rock mass. This is because of how fast the lava cooled, which made the composition of the volcano's walls weak. The makeup of the fast-cooling lava causes gasses to get trapped within, making the rock weak and easily broken up by further eruptions. Stratovolcanoes are also called composite volcanoes. This is the last of the three major types of volcano. They are built by many layers of lava and ash over time hardening on top of each other, and this also is the reason for the term 'composite volcano'. Stratovolcanoes have steep sides to their hills and have explosive, violent eruptions. The same thing that makes up cinder cones' steep hills is responsible for stratovolcanoes' same features- the slow moving, quick cooling lava that is emitted. These volcanoes are some of the most common found on earth, unlike shield volcanoes. These are also often the most dangerous to people because of the explosive eruptions. An example of this type of volcano is Mt. St. Helens. A supervolcano is a volcano that is generally much larger than others, an example of a supervolcano is the volcano beneath Yellowstone National Park. It has not erupted for about seventy thousand years ago, but is not considered dormant due to the continuing volcanic activity. This type of volcano often has the potential to effect extremely large scales of area, even possibly whole continents could be effected by an eruption from such a volcano. During an eruption, the molten magma will come out of the volcano somewhere, and also emitted are various hot gasses, ash, and miscellaneous rocks and minerals. Mudslides, earthquakes and hot springs are all activities that usually occur during eruption. Mudslides are caused by the ice on top of the volcano melting due to the high temperatures, making the water mix with mud and debris. The earthquakes are sometimes a precursor to a volcanic eruption, a warning sign of sorts. | |
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