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volcanoes

volcanoes. By Robbie Barker, Maximilian Bryson, and Brendan P etrili. What is a volcano. A volcano is an opening in the Earth’s surface through which magma rises. Formation of volcanoes. 1.Most volcanoes occur at colliding boundaries.

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volcanoes

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  1. volcanoes By Robbie Barker, Maximilian Bryson, and Brendan Petrili

  2. What is a volcano • A volcano is an opening in the Earth’s surface through which magma rises.

  3. Formation of volcanoes • 1.Most volcanoes occur at colliding boundaries. • A. less dense magma rises up through the fault. • 2.Other volcanoes occur at spreading boundaries on the ocean floor. • A. calmer eruptions-lava flows onto the ocean floor. • B. a new floor is created.

  4. Types of volcanoes • 1. shield-formed from lava flows that harden. • 2. cinder cone volcano-formed from explosive eruptions in which volcanic materials are thrown high in the air and pile up around the vent of volcano. • 3. composite-formed from alternating lava flows and explosions.

  5. Volcanic features • 1. crater-deep sided depression at the top or on the side of a volcano formed during an eruption. • 2. magma- molten rock inside the Earth. • 3. lava- molten rock which reaches Earth’s surface. • 4. caldera- crater at least 1.6 km wide. • 5. geysers- groundwater heated by boiling trapped magma which erupts on the Earth’s surface. Example: Old faithful.

  6. volcanic features continued • 6. volcanic ash- tiny bits of rock that fly into the air during an eruption, can form a thick cloud of ash and cinders.

  7. Other facts about Volcanoes • 1. Volcanic flow can reach up to 2000 degrees Fahrenheit. • 2. the less gas the less dramatic eruption. • 3. 260,000 people have died in the last 300 years due to volcanic eruptions. • 4. 90% of all volcanoes are in the Ring of Fire along the edges of the Pacific Ocean.

  8. Other facts continued • 5. about 1900 volcanoes are likely to explode again. • 6. Ash and toxic gasses can cause lung damage. • 7. Volcanoes usually exist along the edges of tectonic plates.

  9. Volcanoes in the U.S. Mount St. Helens- last eruption is in 2008 Mount Barker- last eruption in 1880 Gorda Ridge- last eruption in 1996 Northwest Rota- last eruption 2004 Kilauea- last eruption 2010 Mount Cleveland- last eruption 2008

  10. DO YOU THINK YOU REMBER THE THINGS WE SHOWED YOU??????????

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