Video Review Question Set – Earth Revealed Volcanism
Watch the video and answer the following review questions.
ANSWER KEY
1. In what year did the voyager launch?
1988.
2. What two planetary bodies have volcanoes?
Jupiter’s moon, Io. Venus. Mars.
3. What is the name of the largest volcano?
Olympus Mons. 3x height of Everest.
4. What is Olympus Mons comparable to?
The height of Everest and is 3x it’s height. 600 km wide.
5. How many known active volcanoes are there on dry land? The ocean?
500. Several 1,000 on sea floor.
6. True or False: The Hawaiian Chain lies on a divergent plate boundary.
False. It doesn’t lie on the divergent plate boundary.
7. What plate do the Hawaiian Islands sit on?
The Pacific Plate.
8. What are shield volcanoes?
They are volcanoes in which there are vast broad mountains. Why are they called this? Because it can
spread out over long distances on low slopes. Can travel to 10-30 kilometers.
9. Definition of Rift Zones:
is a place in which lava can go through flanks with intruding magma.
10. Describe composite volcanoes.
They are made of alternating layers of lava flows and explosive eruptive fragments.
11. What are the most common substances in volcanic gas?
Water vapor, carbon dioxide, sulfur, and nitrogen.
12. What is black volcanic rock mostly made out of?
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Basalt.
13. True or False: Magma with lower silica content is cooler in temperature.
False. It is higher in temperature.
14. What is pumice?
It is a volcanic rock formed in the eruption of viscous highly gaseous magma.
15. True or False: Pumice can float in water.
True.
16. What are the two terms for the lava surfaces that influence viscosity?
Runny lava. Degassed lava.
17. What is a cinder cone volcano composed of?
It is composed of fragments of volcanic rock.
18. What are cinders?
Cinders are droplets of lava much like ash but larger pieces.
19. What is obsidian?
Viscous magma composed of almost entirely of silica.
20. How does ground affirmation help a geologist?
It measure the shape of the volcanoes during it’s swelling.
21. What are fumaroles?
They are steaming vents that emit gas.
22. What do geologists hope to find out more about?
How the heat emits from the eruption deposit and also to know the underground structure.
23. How do geophysicists measure the resistance of rocks to electrical currents?
They measure the magnetism of the vented areas.
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