1. Volcanoes 6 th grade quiz practice Ms. Cooper’s class

2. What is the difference between Magma and Lava?

3. Magma is melted rock inside the earth. Once it comes out of the earth, it’s called lava

4. What do we call a volcano that is no longer able to erupt?

5. extinct

6. What do we call a volcano that has recently erupted?

7. Active

8. What do we call a volcano the are not active now, but may become active in the future?

9. dormant

10. What is the “Ring of Fire” and where is it?

11. A ring of volcanoes and earthquakes located where the oceanic crust of the Pacific Plate is subducting under other plates.

12. How are volcanic island chains formed?

13. As a lithospheric plate moves over a hot spot, a series of volcanoes form

14. What is the name for a flat and wide volcano that has low-silica magma with low or high levels of dissolved gas?

15. Shield Volcano

16. Where do Shield Volcanoes form?

17. Over Oceanic Plates

18. What kind of volcano has low-silica magma with high levels of dissolved gas that produce “fire fountain” eruptions?

19. Cinder cone

20. What kind of volcano that is formed by layers of silica-rich lava and ash is tall, explosive and cone- shaped?

21. Composite Volcano

22. Where do Composite Volcanoes form?

23. At Subduction zones (convergent plate boundries)

24. What kind of rocks are found at shield volcanoes?

25. Basalt

26. What kind of rocks are found at composite volcanoes?

27. Andesite Rhyolite Granite

28. Describe magma that is high in silica.

29. High Viscosity: Thick, sticky (like peanut butter)forms composite volcanoes

30. Describe magma that is low in silica.

31. Low Viscosity: Runny, thin (like ketchup). Forms shield or cinder cone volcanoes.

32. What is the name for a bowl shaped crater that forms on top of cinder cone volcanoes?

33. Caldera

34. How does cooling rate relate to crystal size in the formation of igneous rocks?

35. Slow cooling magma has time to form large crystals. Magma that cools quickly has smaller crystals. fast cooling obsidian slow cooling granite