Where was the evidence found that proved that the continents do drift?

Mid-Atlantic Ridge or mid-ocean ridge


The primary cause of continental drift, earthquakes and volcanic eruptions is what?


Convection currents inside the EarthÕs mantle

























3.  The diagram above illustrates some of the major geologic events that occur on the EarthÕs surface. What causes these events?

Convection currents inside the EarthÕs mantle


4.  In order to complete a convection current within the earthÕs surface, the rising material must eventually     


cool and sink back down into the Earth




The diagram above illustrates what type of geologic event on the Earth?


Seafloor spreading at a divergent boundary


6.  Most geologists think that the movement of EarthÕs plates is caused by


convection currents in the mantle or asthenosphere


7.  The presence of the same        on several continents supports the idea of continental drift.


Rocks, fossils, mountains, and glaciers




8.  _________ helped to solve the problem of how continents move.



Theory of Sea-floor spreading

Please use the following graphic for this question.


9.  What is the correct order of EarthÕs layers (starting from the surface)?


Crust, mantle, outer core, inner core













10. The illustration above represents what theory?

Pangaea or continental drift


11. The theory of plate tectonics states


the EarthÕs crust is broken into a number of large moving slabs



12. The movement of the crustal plates causes


earthquakes, volcanoes, mountains, and new seafloor



13. A boundary where two tectonic plates come together, or collide, is called a



convergent boundary


14. Which explains why the continental crust floats on top of the mantle?


The crust is less dense than the mantle



15. Which layer of the Earth is divided into tectonic plates?


The lithosphere or crust

16. Which layer of Earth makes up 66 percent of EarthÕs mass and 80 percent of EarthÕs volume?


The mantle



17. The upper crunchy part of the  mantle and crust together make up which part of  the Earth?




18. Which technology would be capable of detecting the movement of EarthÕs crustal plates?



19. The diagram below shows the EarthÕs layers.

Which layers above are known as the mantle?


E is the upper mantle and D is the lower mantle


20. The deepest, densest part of EarthÕs interior consist of two zones: the


the inner core and the outer core

21. The inner core of the earth is solid because

of the incredible pressure squeezing it from the outer core, the mantle, and the crust



22. The density is highest in EarthÕs


inner core


23. The          is the largest layer inside the Earth.


The mantle



24. The EarthÕs core is mainly composed of what?


Iron an nickel




25. Pressure increases with depth toward the center of Earth. In which layer would you expect pressure to be the greatest?


Core or Inner core


26. The majority of the EarthÕs volume is made up of___________?




27. What is the process called when a plate of ocean crust collides with a plate of continental crust, the denser oceanic plates slides under the lighter continental plate and plunges into the mantle?


Subduction zone


28. Most earthquakes happen          .


along plate boundaries


29. Where are volcanoes most likely to form?


Along plate boundaries

30. Which boundaries are found where continental plates slide along side of each other?


Transform boundaries


31. Which boundaries happen where continental plates collide or crash together?

Convergent boundaries


32. The theory of plate tectonics attempts to explain what?


Why the EarthÕs upper layers move; or why the lithospheric plates move


33. What does the theory of plate tectonics say?


The EarthÕs crust is broken up into large slabs that move




Most earthquakes and volcanoes occur in the areas of the earth surrounding the Pacific Ocean called the ÒRing of FireÓ as seen in the illustration above. Why?


The Ring of Fire follows tectonic plate boundaries

35. Where are rift valleys and mid-ocean ridges most likely to occur?


Along divergent plate boundaries