1. The ring of Fire is a long string of volcanoes located around the edge of _____________________.

2. The Pacific Ocean
The Atlantic Ocean
Africa
Australia

3. Where do most volcanoes occur?

4. In the tropics
In the middle of tectonic plates
Along the edges of tectonic plates
Along earthquake faults

5. Which of these geologic formations would probably be found along the boundary where two tectonic plates meet?

6. A plateau
A natural bridge
A volcano
An ocean

7. Where are most volcanoes located?

8. In Africa
In the middle of tectonic plates
Along the edges of tectonic plates
In the middle of continents

9. Along the west coast of South America, one plate is diving beneath another plate, creating volcanic mountains. This process is known as_____________________

10. Subduction
Faulting
Isostasy
sedimentation

11. New islands are continuously being formed in the Hawaiian Island chain because___________________.

12. A rift valley is opening up in the Pacific Ocean
The pacific plate is moving over a hot spot
The islands are moving over a plate boundary
The islands are sinking into the Earth’s crust

13. What are the two main gasses released by volcanoes?

14. Hydrogen and helium
Argon and neon
Methane and propane
Water vapor and carbon dioxide

15. What property of liquid rock enables it to rise up through cracks in the earth’s crust?

16. Color: Liquid rock is lighter in color than solid rock
Texture: Liquid rock is smoother than solid rock
Density: Liquid rock is less dense than solid rock
Temperature: Liquid rock is hotter than solid rock

17. Why would it be more likely that you would see lava as opposed to magma?

18. Lava is the term for magma after it has flowed out of the ground
Magma is much hotter than lava so you can not see it as well.
Magma can only be found and seen at the bottom of the ocean.
Magma is much darker in color than lava so it is harder to see.

19. What do minor earthquakes in the vicinity of a volcano indicate?

20. There is a fault inside the volcano
The tectonic plates are moving
Magma inside the volcano is getting hotter
Magma inside the volcano is rising

21. What causes molten rock to explode out of a volcano?

22. Gravity
Earthquakes
Expanding gases
inertia

23. How is a volcano like a water faucet?

24. Both a volcano and a water faucet can be turned on and off at will
Both a volcano and a water faucet work because of a difference in temperature
Both a volcano and a water faucet have chambers directly below them
Both a volcano and a water faucet are locations where a fluid can flow out of an otherwise closed system.

25. Magma inside the earth may start to rise because it is ________________than the surrounding rock.

26. Less dense
More dense
Cooler
More viscous

27. Why do most volcanoes form near the boundaries of tectonic plates?

28. There are week spots at the boundaries so magma can erupt there
Magma can rise up between the plates when the plates move apart at these boundaries
Magma is stronger near the boundaries of tectonic plates so this where volcanoes often form.
There is an abundance of magma at the boundaries of tectonic plates so eruptions often occur here.