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Volcano 3


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5th grade presentation about volcanos

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Volcano 3

  1. 1. Volcanoes<br />By: Tyler Rozwadowski & Sarah Billings<br />
  2. 2. How do volcanoes form?<br /> A volcano is formed when there are cracks in the plates. When a denser plate, such as the oceanic plate, sub ducts under another plate, either a continental or oceanic plate, the sub ducted plate will melt under extreme temperatures in the mantle. This will form cracks in the plates, which results in magma flowing out from the mantle through the cracks in the plate and out onto Earth&apos;s surface. The magma will then harden and form layers, slowly forming a volcano.<br />
  3. 3. How do volcano eruptions happen?<br /> Deep inside Earth, between the molten iron core and the thin crust at the surface, there is the mantle, a large layer of rock that is largely solid, but flows like plastic. Then, for various reasons*, rock from the mantle melts, it sometimes moves to the Earth’s surface through weak spots in the crust, releasing heat, gasses, and rock--a volcanic eruption. <br /> *The various reasons are: extremely high temperatures and pressure can cause the lower mantle to melt and become liquid rock, or magma. When a body of magma rises through the denser rock layers toward Earth&apos;s surface, some of it remains liquid. Magma that has reached the surface is called lava.<br />
  4. 4. What is the biggest volcano in the world and where is it?<br /> The largest volcano in the world is Mauna Loa on Hawaii’s Big Island. It is 56,000 ft. tall.<br />
  5. 5. About how many volcanoes are there in the world<br /> There is about 500 active volcanoes known on earth, not counting those that lie beneath the sea.<br />
  6. 6. It affects our health when we inhale the smoke the volcano produces and it affects the environment by releasing gases into the atmosphere that can destroy the ozone layer. Also, each time a volcano erupts it increases the<br /> world’s average temperature by ½ degree Fahrenheit.<br />How do volcano eruptions affect people and our environment?<br />