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CHSCheyScienceCh6S1

QuestionAnswer
What's a volcano? Weak spot in crust where magma comes to surface
What's magma? Where does it form? Molten mixture of rock formed in mantle
What's lava? What does it become when cooled? Magma that reached surface; becomes rock when cooled
Is volcanic activity a constructive or destructive force? Why? Volcanic activity is a constructive force. When lava is cooled, it hardens, adding new material to Earth's surface
Hot spot? an area where magma from deep within the mantle melts through the crust.
Do hot spots result from subduction? No
How many volcanoes are currently active on land? More than 600
Where does volcanic activity most often occur at? divergent plate boundaries; convergent plate boundaries; hot spots far from boundaries of continental/oceanic plates
Where do volcanic belts form at? almost always occur along other plate boundaries
Ring of Fire? belt of volcanoes that rim Pacific Ocean
Where do the volcanoes at mid-ocean ridge rise above ocean's surface? Iceland and Azore Islands
Why do many volcanoes occur on islands near where two oceanic plates collide? When two oceanic plates collide, subduction causes oceanic plate to sink, rock heats, becomes magma, seeps through crust, breaks through crust; volcanoes occur
Island arc? A string of islands formed by the volcanoes along deep ocean trench
What are examples of island arcs? Indonesia, Japan, New Zealand, Carribean Islands, Philippines, Aleutians (tail of Alaska)
How do volcanoes on land form? Subduction occurs where edge of continental plate collides with oceanic plate; collision creates volcanic eruptions
What are examples of volcanoes on land? Andes Mountains in South America, Pacific Northwest in northwestern United States
Where do hot spots occur? Lie in middle of continental or oceanic plate far from plate boundaries
What are examples of hot spots? Hawaiian Islands, Yellowstone National Park
What are the four materials that determine the explosiveness of an explosive volcano? Gas content, viscosity, temperature, and silica content
Created by: nyxshadow
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