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Volcanoes

Volcanoes. By : Charlotte Adams :]. What is a volcano?. A volcano is mountain with an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface. . Where are volcanoes formed?.

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Volcanoes

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  1. Volcanoes By : Charlotte Adams :]

  2. What is a volcano? • A volcano is mountain with an opening, or rupture, in a planet's surface or crust, which allows hot, molten rock, ash, and gases to escape from below the surface.

  3. Where are volcanoes formed? • Volcanoes are usually formed on tectonic plate boundaries where the plates have converged.

  4. Cinder Cone Volcanoes • These are one of the simplest types volcanoes.

  5. Composite Volcanoes. • Also calledStratovolcanoes. • Form mountains

  6. Shield volcanoes • Composed mostly of fluid lava.

  7. The evolution of the Volcano. • A – magma and lava. • B – the cone is built. • C – erosion starts to destroy the cone. • D - continued erosion removes the cone.

  8. Top 10 Largest Volcanoes in the World. • 1. Mount Mazama/Crater Lake, Oregon • 2. Mount Etna, Sicily • 3. Mount Vesuvius, Italy • 4. Mount Tambora, Indonesia • 5. Mount Krakatau, Indonesia • 6. Mount Pelee, Martinique • 7. Parícutin, Mexico • 8. Mount St. Helens, Washington • 9. Nevada del Ruiz, Colombia • 10. Mount Pinatubo, Philippines

  9. Active volcanoes in the United States.

  10. Underwater Volcanoes • They estimate that in total there could be about 3 million submarine volcanoes. • Researchers have counted 201,055 underwater cones.

  11. Facts about Volcanoes. • More than 80%of the Earth’s surface is volcanic in origin. • There are about 1,500 active volcanoes in the world that have erupted in the past 10,000 years.

  12. Facts Continued… • Jupiter’s moons are the most volcanic places in the solar system. • More than half of the world’s active volcanoes above sea level encircle the Pacific Ocean to form the “Ring of Fire”. • The rock debris carried by the blast of Mount St. Helen’s eruption traveled as fast as 250 miles per hour!

  13. Signals to predict an eruption • Increasing temperature of hot springs near the volcano. • Changes in the shape of the volcano and the surrounding land. • Increase of hot gases and ash from the vents • Small earthquakes around the volcano.

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