1. I-4 & I-5 Flashcards

2. “Weak sphere”
Layer that is involved in mantle convection

3. Asthenosphere

4. Line where it is hot enough below to flow and is cool and rigid above

5. Boundary between lithosphere and asthenosphere

6. Thick, less dense, and older

7. Continental crust

8. Boundary where plates are moving toward one another

9. Convergent Boundary

10. Example of a transform boundary

11. San Andreas Fault

12. Collision zone where subduction is active, earthquakes and volcanoes are possible

13. Subduction
Continent-Oceanic collision

14. Large forces build up within the lithosphere, forces become greater than the strength of the rock thus fracturing.

15. Fault

16. A place where molten rock, solid fragments and gases erupt at the Earth’s surface

17. Volcanoes

18. Mild Eruption

19. Magma with low gas content

20. Magma pockets in the mantle that do not move. Ocean plates move
Magma pockets in the mantle that do not move. Ocean plates move. Occur far from plate boundaries.

21. Hot spot volcano

22. Formed when 2 continental crusts collided. Still forming. No subduction.

23. Himalayan mountains

24. Rigid outer portion of the Earth
Rigid outer portion of the Earth. Composed of crust and the outer part of the mantle.

25. Lithosphere

26. Thin, more dense, and younger.

27. Oceanic crust

28. Boundary where plates are moving away from each other

29. Divergent Boundary

30. Boundary where plates are sliding past one another (very slow).

31. Transform Boundary

32. Area where plates are consumed (melted and recycled); one plate dives down underneath the other into the mantle.

33. Subduction

34. Collision zone where there is no subduction and mountains are formed.

35. Continent-continent collision

36. Fracture in the Earth’s surface

37. Fault

38. Explosive eruption

39. Magma with high gas content

40. Volcanic rock found along the Mid-Ocean Ridges

41. Basalt

42. Pacific Ocean rimmed with subduction zones
Pacific Ocean rimmed with subduction zones. Earthquakes and volcanoes are common.

43. Ring of fire

44. A continuous mountain range extending throughout the ocean
A continuous mountain range extending throughout the ocean. It is seismically active and often has a rift valley. Divergent plate boundaries. Site of sea-floor spreading.

45. Mid-ocean ridge