Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Volcanoes
Document related concepts
Craters of the Moon National Monument and Preserve wikipedia , lookup
Mono–Inyo Craters wikipedia , lookup
Sidoarjo mud flow wikipedia , lookup
Lōʻihi Seamount wikipedia , lookup
Axial Seamount wikipedia , lookup
Mount Rainier wikipedia , lookup
Itcha Range wikipedia , lookup
Mount Pleasant Caldera wikipedia , lookup
Level Mountain wikipedia , lookup
Mount Meager massif wikipedia , lookup
Llullaillaco wikipedia , lookup
Mount Garibaldi wikipedia , lookup
Mount Rinjani wikipedia , lookup
Lascar (volcano) wikipedia , lookup
Mount Pinatubo wikipedia , lookup
Wells Gray-Clearwater volcanic field wikipedia , lookup
Mount Edziza volcanic complex wikipedia , lookup
Mount St. Helens wikipedia , lookup
Olympus Mons wikipedia , lookup
Mount Pelée wikipedia , lookup
Cascade Volcanoes wikipedia , lookup
Volcano (1997 film) wikipedia , lookup
Mount Vesuvius wikipedia , lookup
Silverthrone Caldera wikipedia , lookup
Nevado del Ruiz wikipedia , lookup
Cerro Azul (Chile volcano) wikipedia , lookup
Transcript
Volcanoes 8th grade Physical Science How are Volcanoes Formed? O Gases force magma, melted rock in the Earth to rise. If magma breaks through the Earth’s surface, a volcano is formed. Three Different Types of Volcanoes O Shield Volcano O Composite Cone Volcano O Cinder Cone Volcano Shield Volcano O They release relatively fast-moving less gassy lava, and tend to have less explosive eruptions than other types of volcanoes. O People often walk fairly close to these erupting volcanoes. O They usually form large, broad volcanoes. Mount Bachelor in Oregon Composite Cone Volcano O These volcanoes have explosive eruptions as a result of more gassy magma. O They are formed from layers of lava and ash. O Composite Cones are also known as stratovolcanoes. Mount St. Helens in Washington Cinder Cone Volcano O These are the smallest and most common volcanoes O They are formed from explosive eruptions that shoot small pieces of magma and ash into the air. O The magma then cools and hardens as it falls back to the Earth, forming a cinder cone. O In many cases, cinder cones form on the sides of a larger volcano. Mt. Etna in Italy Active Volcano O Active volcanoes is one that has erupted since the last ice age approximately in the past 10,000 years. Dormant Volcano O Dormant volcanoes would then be one that hasn’t erupted in the past 10,000 years, but it is expected to erupt again. Extinct Volcano O Extinct Volcanoes would be one that nobody expects to ever erupt again. Two Types of Eruptions O More gassy eruptions O Less gassy eruptions More Gassy Eruptions O Explosive and violent eruption and magma shoots out of the volcano. Less Gassy Eruptions O More quiet eruption. The magma just flows smoothly out of the volcano. Ring of Fire O Many volcanic eruptions have occurred worldwide.
