Volcanoes 6 th grade quiz practice Ms. Cooper’s class.
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Transcript of Volcanoes 6 th grade quiz practice Ms. Cooper’s class.
![Page 1: Volcanoes 6 th grade quiz practice Ms. Cooper’s class.](https://reader034.fdocuments.in/reader034/viewer/2022051216/56649ee75503460f94bf858f/html5/thumbnails/1.jpg)
Volcanoes6th grade quiz practice
Ms. Cooper’s class
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What is the difference between Magma and Lava?
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•Magma is melted rock inside the earth. Once it comes out of the earth, it’s called lava
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•What do we call a volcano that is no longer able to erupt?
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•extinct
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•What do we call a volcano that has recently erupted?
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•Active
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•What do we call a volcano the are not active now, but may become active in the future?
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•dormant
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•What is the “Ring of Fire” and where
is it?
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• A ring of volcanoes and earthquakes located where the oceanic crust of the Pacific Plate is subducting under other plates.
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•How are volcanic island chains
formed?
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•As a lithospheric plate moves over a hot spot, a series of volcanoes form
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•What is the name for a flat and wide volcano that has low-silica magma with low or high levels of dissolved gas?
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•Shield Volcano
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•Where do Shield Volcanoes form?
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•Over Oceanic Plates
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•What kind of volcano has low-silica magma with high levels of dissolved gas that produce “fire fountain” eruptions?
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•Cinder cone
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•What kind of volcano that is formed by layers of silica-rich lava and ash is tall , explosive and cone-shaped?
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•Composite Volcano
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•Where do Composite
Volcanoes form?
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•At Subduction zones
(convergent plate boundries)
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•What kind of rocks are found
at shield volcanoes?
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•Basalt
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•What kind of rocks are found at
composite volcanoes?
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•Andesite
• Rhyolite
•Granite
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•Describe magma that is high in silica.
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•High Viscosity: Thick, sticky (like peanut butter) forms composite volcanoes
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•Describe magma that is low in silica.
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•Low Viscosity: Runny, thin (like ketchup). Forms shield or cinder cone volcanoes.
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•What is the name for a bowl shaped crater that forms on top of cinder cone volcanoes?
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•Caldera
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•How does cooling rate relate to crystal size in
the formation of igneous rocks?
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•Slow cooling magma has time to form large crystals. Magma that cools quickly has smaller crystals.
fast cooling obsidian slow cooling granite