Volcanoes+Types

1. Shield Volcanoes 2. Cinder cone Volcanoes 3.Composite Volcanoes The Shield volcanoes are known as the biggest volcanoes and that they are formed went free flowing lava spills and spreads. The Composite Volcano is built up when there are lots of eruptions, and then Composite Volcanoes start to form. Cinder cone Volcanoes are formed by lava fragments called cinder. The fragments are from a single vent and build up around the vent when they fall back to earth.
 * Volcanoes[[image:volcano[1].jpg width="438" height="236" align="left"]]There are three types of Volcanoes in the world **

Shield Volcanoes

Shield Volcanoes are the biggest kind of volcanoes on earth. Shield Volcanoes do have eruptions but they are really small ones that are not dangerous. When a eruption happen basaltic lava spreads out in flat layers. Then the layers become gently sloping slides called a shield volcano. Shield volcanoes ... are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central top hole. building up a wide, gently sloping cone of flat, dome looking shape They are built up slowly by the increasing thousands of flows of basaltic (from //basalt//, a hard, dense dark volcanic rock) lava that spread widely over great distances, and then cool as thin, softy dipping sheets. Lavas also commonly erupt from vents along. The world Largest Shield volcano is Mauna Loa which is in Hawaii.

Composite Volcanoes Composite volcanoes, also called strato volcanoes, are formed by irregular layers of lava and rock fragments. This is the reason they are called composite. Strato-volcanoes often form in a cool way, between eruptions they are often so quiet they seem as if it not happening. To witness the start of a great eruption requires a lot of luck or very careful observation. Composite volcanoes usually erupt in an explosive way. This is usually caused by viscous magma. When very viscous magma rises to the surface, it usually clogs the craterpipe which is near the top, and gas in the craterpipe gets locked up. Therefore, the pressure will increase resulting in an explosive eruption. Then it becomes dangerous.

Cinder Cone VolcanoCinder cone volcanoes are the most common kind of volcanoes. They are steep sided cones of basaltic fragments and are smaller and simpler than composite volcanoes. Streaming gases carry liquid lava blobs into the atmosphere that fall back to earth around a single vent to form the cone. The volcano forms when ash cinders and bombs pile up around the vent to form a circular or oval cone. Cinders are melted volcanic rock that cooled and formed pebble-sized pieces when it was thrown out into the air. They are ejected from a single vent and accumulate around the vent when they fall back to earth. Cinder cones build from erupting lava that breaks into small pieces as it blasts into the air. As the lava pieces fall back to the ground, they cool and harden into cinders that pile up around the volcano's vent.

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