1. Chapter 6 Volcanoes Review Game

2. Rules Coin toss for 1 st question Team will answer the question, random selection Correct answer gets the team a point Wrong answer gives the other team a chance to steal- random choice Team with highest score gets 5 bonus points for the test

3. 1) Define Volcano A weak spot in the crust where molten material comes to the surface

4. 2) What is the ring of fire? A major volcanic belt that rims the Pacific ocean

5. 3) Explain how volcanoes form at converging plate boundaries. Subduction forces crust into the mantle where it melts, rises, and breaks through the crust

6. 4) Explain what a “hot spot” is. Magma melts through the crust like a blowtorch

7. 5) Give an example of a hot spot volcano that formed on oceanic crust. Hawaii

8. 6) Give an example of a hot spot volcano that formed on continental crust. Yellowstone

9. 7) What is an island arc? A string of volcanic islands along an oceanic plate boundary

10. 8) What process forms an island arc? When an oceanic plate subducts under another oceanic plate, melts, rises forming island volcanoes

11. 9) Why does magma rise? Liquid magma is less dense than the surrounding rock and flows upwards into cracks

12. 10) What is a magma chamber? As magma rises to the surface it forms a large underground pocket

13. 11) What does a “pipe” in a volcano do? A crack in the crust where magma reaches the surface

14. 12) What is a Volcano vent? A point on the surface where magma leaves a volcanic pipe

15. 13) What is a lava flow? The river of lava that pours down a volcano

16. 14) What is a crater? The bowl shaped area that forms around the main vent

17. 15) What 2 factors effect how thick or fluid a volcano’s magma is? Temperature and silica content

18. 16) What is pahoehoe lava? Fast moving hot flowing lava

19. 17) Describe aa lava Lava that is cooler and slower moving made up of jagged lava chunks

20. 18) What determines if a volcanic eruption is quiet or explosive? The more silica content in the magma, the more trapped gases, the cooler the lava.

21. 19) What is a pyroclastic flow? An explosive eruption hurling out ash, cinders, bombs, and gases

22. 20) What are the 3 stages of a volcano? Active, dormant, and extinct

23. 21) How is a hot spring or geyser a form of volcanic activity? A body of magma (geothermal energy) is heating the water of a hot spring or geyser

24. 22) What are some of the ways geologists monitor volcanoes? Tiltmeters, laser ranging devices, local magnetic field, water levels in the crater, escaping gases, and temperature

25. 23) Describe volcano hazards from a quiet eruption Lava flows from an eruption can burn everything in its path.

26. 24) Describe volcano hazards from an explosive eruption Volcanic ash can bury entire towns, damage crops etc.

27. 25) What is a volcanic neck, dike, & sill? Neck- magma hardens in a pipe Dike- Hardened magma that forced its way across layers of rock Sill- Magma squeezes between layers of rock

28. 26) What is a batholith? A large magma body that cools within the crust

29. 27) What is a shield volcano? Lava flows gradually build a wide gently sloping mountain

30. 28) What is a composite volcano? Lava flows alternating with eruptions of ash, cinders, and bombs form a tall cone shaped volcanoe

31. 29) What is a cinder cone volcano? Ash, cinders, and bombs build up around the main vent in a steep cone shaped pile

32. 30) What is a caldera volcano? The huge hole that is left from the collapse of a volcano’s main chamber

33. 31) What is a lava plateau? Floods of lava build up in layers forming a plateau