"Chapter 6: Volcanoes": HTML5 Crossword

Across

2. The Hawaiian Islands are an island arc that formed over this. (3,4)
5. This was the city in Italy that was destroyed by a large mud flow. (11)
9. This is the name of the instrument that detects movements of the Earth by volcanoes. (11)
10. What volcano destroyed the Italian towns of Pompeii and Herculaneum? (8)
12. Mt. Pinatubo is located within this chain of islands. (11,7)
14. This is the name for a larger crater depression at the top of volcanoes. (7)
16. Volcanoes occur at regions where one plate goes beneath the other known as this. (10,4)
18. Name the island off the coast of Iceland that is formed from an undersea volcano. (7)
19. Most volcanoes are found in this area. (3,4,2,4)
20. Sulfur dioxide mixes with water to form this. (8,4)

Down

1. In which direction is the Pacific Plate moving? (9)
3. This is the type of volcano that has not erupted in recorded history. (7)
4. What gas coming in larger amounts from a volcano due to erupt is detected by satellites? (6,7)
6. This is the type of volcano that erupts on a regular basis. (12)
7. The Great Rift Valley is found here. (6)
8. Slow, steady, and fluid lava flow is the sign of this type of volcano that has gentle slopes. (6,7)
11. Magma that reaches the surface is known as this. (4)
13. What two factors cause volcanoes? (8,3,11)
15. This is the type of volcano that hasn't erupted in recent history but could. (7)
17. Which type of volcano is most violent? (9)