8 th grade Earth Science. Shield Composite Cindercone.

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Presentation transcript:

8 th grade Earth Science

Shield Composite Cindercone

Formed by layer after layer of lava. Usually have low silica content, and gases can escape easily. Has quiet eruptions. Extremely broad and flat in shape. Found in Hawaii.

Shield volcanoes have gently sloping sides that can stretch for miles. These pictures are Mauna Loa, a volcano on the Big Island of Hawaii.

Can sometimes be called Stratovolcanoes. Formed by alternating layers of lava flow and cinders or ash. Has a high silica content and gases are usually trapped. Has explosive eruptions. Mount St. Helens and Mount Rainier in Washington.

Mt. Mayon, Phillippines (left) Arenal, Costa Rica (below) Mt. Rainier, Washington (bottom, left)

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Virtual Tour of Mt. St. Helens Virtual Tour of Mt. St. Helens Harry Truman – the man who refused to leave “his” mountain.

Formed by layers of cinders and ash, not a lot of lava erupts from these volcanoes. Very explosive when it erupts. Has trapped gases. The shape is nearly perfect on all sides… almost like an orange road pylon.

This eruptions that created Paricutin began in 1943 and continued to Most of the explosive activity was during the first year of the eruption when the cone grew to 1,100 feet (336 m). The cone continued to grow for another 8 years but added only another 200 feet.

In mythology, Etna was identified as the location of the forge of Volcan, home of the Cyclopses, and where the giant Enceladus laid (eruptions being his breath and earthquakes being his motion). Etna’s beauty, frequent eruptions, and long record of eruptions makes it one of the world’s best know volcanoes.

Both pictures are the remaining core of the volcanic neck of a once active volcano. Located in Wyoming (left) Ship Rock, San Juan County New Mexico (below)

Mt. St. Helens has been periodically erupting for the 2 years. It is building its peak back up --- slowly but surely.

Montserrat Volcano in the Caribbean. A large explosion and dome collapse occurred on March 3, 2004, causing a high eruption column and basal surge.

Etna Volcano in Sicily Late October, 2002

Lava – molten rock that oozes out of volcanoes. Tephra Ash – smallest sized tephra Cinders – small pieces of cooled lava up to the size of a basketball. Bombs – any projectile bigger than a basketball.

Volcanic ash can cover areas like a snow storm

Aa – Thick, chunky and difficult flow Pahoehoe – Thin, watery, and easily flows

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