Download 7 Grade: Ch. 10 STUDY GUIDE KEY

Name: ____________________________________ Class: _______________ Date: _____________
7th Grade: Ch. 10 STUDY GUIDE KEY
Write out all questions and their answers in your journal. Take as many pages as you need – don’t crowd your
work! The test is: ___________________
1. What was Wegener’s hypothesis of continental drift?
The continents were once joined together in a single landmass
2. What is Pangaea?
Pangaea is the name of the supercontinent that existed millions of years ago
3. What is a fossil?
Any trace of an ancient organism that has been preserved in rock
4. What technology did scientists use in the mid-1900’s to map the mid-ocean ridge?
Sonar
5. Where does molten material rise from the mantle when it erupts?
Along Mid-ocean Ridges
6. Old oceanic crust is more ____________ than new oceanic crust because it is cool.
Dense
7. What do most geologists think causes the movements of Earth’s plates?
Convection currents in the mantle
8. What is the theory of Plate Tectonics?
Plate Tectonics is the theory that states that pieces of Earth’s lithosphere are in constant slow motion.
9. When two plate slip past each other, moving in opposite directions, what boundary is present?
Transform Boundary
10. A collision between two pieces of continental crust at converging boundaries produces:
Mountain ranges
11. What does the hypothesis of Continental Drift propose?
All the continents were once joined in a single landmass that has since drifted apart.
12. What occurs where the oceanic crust bends down toward the mantle at a deep-ocean trench?
Subduction
13. These are contained in the lithosphere which float above the asthenosphere?
Plates
14. An ocean will _____________ if subduction occurs faster than oceanic crust can be created.
Shrink!
15. Younger oceanic crust can be found near the _______________.
Mid-ocean Ridge
16. Wegener provided evidence to support his theory of
Continental Drift
17. How do plates move at a transform boundary?
Two plates slip past each other, moving in opposite directions
18. What are the three types of evidence Wegener provided?
Land features; fossils; climate
19. Why didn’t most geologists of Wegener’s time accept his idea of the drifting continents?
Wegener couldn’t explain how continents actually moved.
20. What does the term, boundary, mean?
Where one place ends and another begins
21. A continent’s climate gets (warmer/colder) as it moves toward the equator.
22. What feature forms the longest mountain ranges on Earth?
The mid-ocean ridges
23. Where does subduction occur?
At Deep Ocean trenches
24. Which process adds more crust to the ocean floor?
Sea-floor spreading
25. What two processes change the size and shape of the oceans?
Both subduction and sea-floor spreading
26. What does the prefix, “con-“ mean?
Together
27. Older rock samples can be found where?
Far from mid-ocean ridges
28. Sea floor spreading occurs at
Mid-ocean ridges
29. What are transform boundaries?
Where plates slide past each other
30. What currents drive Earth’s plate movements?
Convection
31. What is the motion of Earth’s plates?
Slow and Constant
32. Which land feature forms at convergent boundaries?
Mountain range
33. What transform boundary is found in California?
San Andreas Fault
34. Which theory describes the motion of and force driving Earth’s plates?
Plate tectonics
35. What boundaries are where plates move apart?
Divergent boundaries
36. Draw a transform boundary, a convergent boundary, and a convergent boundary.
37. Identify the three forms of evidence that support scientists ideas of sea floor spreading.
Molten material; magnetic stripes; drilling samples
38. Be able to identify from a drawing what is happening at a deep-ocean trench!
BONUS! Write this 5 times: Packers will beat the Bears!