Answer:
Composite, shield, cinder cones, and supervolcanoes are the main types of volcanoes. Composite volcanoes are tall, steep cones that produce explosive eruptions. Shield volcanoes form very large, gently sloped mounds from effusive eruptions.
Answer:
Composite, shield, cinder cones, and supervolcanoes are the main types of volcanoes.
Composite volcanoes are tall, steep cones that produce explosive eruptions.
Shield volcanoes form very large, gently sloped mounds from effusive eruptions.
Cinder cones are the smallest volcanoes and result from accumulation of many small fragments of ejected material.
An explosive eruption may create a caldera, a large hole into which the mountain collapses.
Supervolcano eruptions are devastating but extremely rare in Earth history.
Review Questions
Rank, in order, the four types of volcanoes from smallest to largest in diameter.
What factor best determines what type of volcano will form in a given area?
Which type of volcano is most common?
Why do pahoehoe and a’a lava erupt from shield volcanoes? Why don’t they erupt from composite volcanoes?
Why are cinder cones short-lived?
If supervolcanoes are so big, why did it take so long for scientists to discover them?
Points to Consider
Composite volcanoes and volcanic cones usually have craters on the top. Why are the craters sometimes U- or horseshoe-shaped?
Think about plate boundaries again. What type of volcanoes do you think are found at convergent, divergent, and transform boundaries? How about at intraplate sites?
Some people have theorized that if a huge asteroid hits the Earth, the results would be catastrophic. How might an asteroid impact and a supervolcano eruption be similar?
Explanation:
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