types of volcano an their definition
Answers
By David Olmstead
In planet’s surface or earth crust there are openings or ruptures that allows volcanic ashes, different gases and hot magma to escape are generally known as Volcanoes. Generally when the tectonic plates converges or diverge these volcanic eruptions takes place. different types of volcanoes of volcanoes that can be found in nature are such as composite volcanoes, shield volcanoes, cinder cones, spatter cones and complex volcanoes. Volcanoes can also be classified according to the types of volcanic eruptions.
Composite or Strato-volcanoes:
A composite volcano is also known as strato-volcano because composite strata or layered structure is formed due to the eruptive material. These volcano formations take place due to number of eruptions for several thousand years. These volcanoes are tall and conical in shape and is formed when hot lava escapes through the ruptures or fissures and flows long way. Andesite magma generally forms the composite cones. The main characteristics of the composite volcanoes are periodic and quiet explosion.
Where are composite volcanoes located?
Composite volcanoes are generally found in chains along the Pacific Rim and are also called the rim of fire.
Shield volcanoes:
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Answer:
Explanation:
There are 4 major types of volcanoes:
Cinder Cone Volcanoes:
These are the simplest type of volcano. They occur when particles and blobs of lava are ejected from a volcanic vent. The lava is blown violently into the air, and the pieces rain down around the vent. Over time, this builds up a circular or oval-shaped cone, with a bowl-shaped crater at the top. Cinder cone volcanoes rarely grow larger than about 1,000 feet above their surroundings.
Composite Volcanoes:
Composite volcanoes, or stratovolcanoes make up some of the world’s most memorable mountains: Mount Rainier, Mount Fuji, and Mount Cotopaxi, for example. These volcanoes have a conduit system inside them that channels magma from deep within the Earth to the surface. They can have clusters of vents, with lava breaking through walls, or issuing from fissures on the sides of the mountain. With all this material coming out, they can grow thousands of meters tall. As we’ve seen with the famous Mount Saint Helens, composite volcanoes can explode violently.
Shield Volcanoes:
These are large, broad volcanoes that look like shields from above – hence the name. The lava that pours out of shield volcanoes is thin, so it can travel for great distances down the shallow slopes of the volcano. These volcanos build up slowly over time, with hundreds of eruptions, creating many layers. They’re not likely to explode catastrophically. Perhaps the best known shield volcanoes are the ones that make up the Hawaiian Islands, especially Mauna Loa and Mauna Kea.
Lava Domes:
Volcanic or lava domes are created by small masses of lava which are too viscous (thick) to flow very far. Unlike shield volcanoes, with low-viscosity lava, the magma from volcanic domes just pile up over and around the vent. The dome grows by expansion of the lava within, and the mountain forms from material spilling off the sides of the growing dome. Lava domes can explode violently, releasing a huge amount of hot rock and ash.