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

 

5. 

 

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?

 

lithosphere

 

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

 

seismograph

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___________?

 

mantle

 

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

 

34.

 

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