Unit 4 Lesson 4 Volcanoes Study Guide (3085)

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?