handout 1 (pink) tectonic plate motion
TRANSCRIPT
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Handout 1 (pink)Tectonic Plate Motion
Standard 2 Objective 3.a, b, c, and d
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1. The theory that explains why and how continents move is called _____________.plate tectonics
Pg. 14
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2. What is “plastic” rock and how does it move?
• Solid rock under great pressure that flows slowly, like putty.
Pg. 14
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3. How many major tectonic plates have scientists identified?
• 15
Pg. 12
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4. How do scientists identify plate boundaries?
• By studying data from earthquakes.
Pg. 13
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5. A sudden movement along the boundary of a tectonic plate is a(n) __________.earthquake
Pg. 13
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6. Frequent earthquakes in a given zone are evidence that
• That two or more plates may meet in the area.
Pg. 13
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7. How do volcanoes help identify the locations of plates boundaries?
• Some volcanoes form when plate motions generate magma that erupts on Earth’s surface.
Pg. 15
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8. A zone of active volcanoes that encircles the Pacific Ocean is known as the• Pacific Ring of Fire
Pg. 12
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9. In addition to volcanoes, what also occurs frequently in the Pacific Ring of Fire?
• earthquakes
Pg. 13
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10. What happens to magma at divergent boundaries?
• Magma rises to the surface as plates move apart.
Pg. 15
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11. A narrow area that forms where the plates at a divergent boundary separate is called a _________.
Pg. 15
rift valley
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12. When oceanic lithosphere collides with continental lithosphere, the oceanic lithosphere is more dense than the continental lithosphere, so it sinks, or _________.subducts
Pg. 15
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13. What deep-ocean feature forms at subduction zones?
• deep ocean trench
Pg. 15
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14. As the oceanic plate subducts, it releases fluids into the mantle, causing magma to form and rise to thesurface, forming ________________.volcanic mountains
Pg. 15
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15. What happens when two plates made of continental lithosphere collide?• The colliding edges crumple and thicken
forming large mountain ranges.
Pg. 15
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16. What is an example of a large mountain range formed when two plates made of continental lithospherecollided?
• The Himalaya Mountains
Pg. 15
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17. What happens when two plates made of oceanic lithosphere collide?
• One plate subducts under the other, forming deep-ocean trenches. Fluids from the subducted plate causes mantle rock to melt and form magma.
Pg. 15
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18. An example of a feature that formed when two plates made of oceanic lithosphere collided is _________________.an island arc (Japan)
Pg. 15
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19. What causes earthquakes at transform boundaries?
• As plates slide past each other horizontally, they scrape against each other.
Pg. 15
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20. An example of a transform boundary is the _______________.San Andreas Fault
Pg. 15
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21. The San Andreas Fault is located between what two plates?
• North American and Pacific plates
Pg. 15
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22. What is an example of a divergent boundary in the mid-Atlantic?
• The boundary of the North American and Eurasian plates.
Pg. 15
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23. The movement of heated material due to differences in density is called
• a. convection.
Pg’s 13 &14
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24. The cycle in which the cooler, denser water sinks and the warmer water rises to the surface to create a cycle is called• c. a convection cell.
Pg’s 13 &14
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25. Earth’s mantle is heated by• b. core energy and radioactivity.
Pg’s 13 &14
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26. What causes tectonic plate movement?
• c. The mantle drags overlying tectonic plates along.
Pg’s 13 &14
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27. What happens to newer, warmer rock at a mid-ocean ridge as it cools?
• c. It sinks into the mantle and pulls away from the ridge.
Pg. 14
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28. The force on the rest of the plate from the asthenosphere below the cooling, sinking rock is called_________.ridge push
Pg. 14
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29. What happens as a result of ridge push?
• It pushes the rest of the plate away from the mid-ocean ridge.
Pg. 14
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30. What happens to magma in places where plates pull away from each other at mid-ocean ridges?
• It rises to the surface.
Pg. 14
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31. The force exerted by a sinking plate caused by the subduction of lithosphere into the asthenosphere iscalled ________.slab pull
Pg. 14
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32. What three forces work together to cause plate motions?
• Drag on the bottoms of tectonic plates, ridge push, and slab pull.
Pg. 14
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The End!!!