NAME ______PERIOD
UNIT 4 LESSON 4 VOLCANOES STUDY GUIDE (3085)
1. Know the difference between magma and lava.Using the following word bank for questions 2 – 8
subductionRing of FireHawaiian islandstectonic plate
hot spotventmagma chambercrater
2. The ______surrounds the Pacific plate and is where lots of volcanoes occur.
3. A ______volcano forms in the middle of plates
above a magma chamber. An example of this type of volcano are the
______.
4. Most volcanoes form along ______boundaries.
5. Volcanoes that form along convergent boundaries may form from ______.
6. The pocket beneath a volcano where molten rock collects is the ______.
7. a bowl-shaped area that forms around a volcano’s vent is called a ______.
8. The opening through which molten rock and gas leave a volcano is called the
______
Using the word bank below answer questions 9- 15
aaPahoehoepyroclastic flowsilicaactive
dormantextinct
9. What is the expulsion of ash, cinder, bombs and gases called? ______
10. The stage of a volcano that means it is unlikely to erupt again is called what?
______
11. A cooler, slower moving type of lava that hardens into rough, sharp chunks of rocks is called what?
______
12. A stage of a volcano that is erupting or has shown signs of erupting in the near future is called what?
______
13. A material found in magma that absorbs moisture and make s the lava thicker is called what?
______
14. A hot, faster moving type of lave that hardens to form smooth, ropelike coils is called what?
______
15. The stage of a volcano that means it does not show signs of erupting in the near future (The volcano is
sleeping.) ______
16. Why does magma flow upward? Because the magma is ______dense than the surrounding rock
17. Circle all the factors that determine how magma flows.
Gasessilicacolortemperaturediameter of vent
Size of craternumber of vents in the volcano
18. The amount of ______in the magma will determine how a volcano will erupt; quietly or explosively.
19. A quiet/explosive (circle one) volcano produces a pyroclastic flow.
20. What volcanic hazard is made up of rocky particles that range from the size of a baseball and a car?
dustashcinderbomb lava(circle one)
21. The main hazard of a quiet volcano is
dustashcinderbomblava (circle one)
Use the following word bank to answer questions 22 –27
Cinder volcanoshield volcanocomposite volcanocalderawest coast
East coastlava plateau
22. A tall, cone shaped mountain in which layers of lava alternate with layer of ash and other volcanic
materials is called a ______.
23. A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions is call a
______.
24. The large hole at the top of a volcano formed when the roof of a volcano’s magma chamber collapses is
called a ______.
25. A steep, cone-shaped hill or mountain made of volcanic ash, cinders and bombs piled up around a
volcano’s opening is called a ______.
26. What is a high, level area made of many layers of thin, runny lava called? ______
27. What part of the United States would be more likely to have volcanic activity?
______
Why?