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Study Guide - Plate Tectonics
______ 1. The youngest part of the ocean floor is found ______
a. along deep sea trenches
c. near ocean ridges
b. where ocean sediments are thickest
d. where Earth’s magnetic field changes polarity
______ 2. At oceanic-oceanic convergent boundary, ______
a. new crust is created
c. old crust is recycled by subduction
b. old crust is deformed or fractured
d. plates side past one another
______ 3. Convection currents transfer thermal energy _____
a. between continents
c. from warmer regions to cooler regions
b. from cooler regions to warmer regions
d. as a result of buoyancy
______ 4. The downward part of a convection current causes a sinking force that _____
a. pulls tectonic plates toward one another
b. moves plates apart from one another
c. lifts and splits the lithosphere
d. creates a divergent boundary
______ 5. What happens to ocean floor as is moves farther away from a rift valley?
a. it gets older
b. it gets wider
c. it gets younger
d. it gets thinner
______ 6. Compared to ocean crust near deep-sea trenches, crust near ocean ridges is _____
a. younger
b. older
c. the same age
d. magnetically reversed
______ 7. Divergent boundaries __________________ happen at oceanic-oceanic boundaries.
a. always
b. sometimes
c. never
d. mostly
______ 8. Convergent boundaries move_______________________________________________________
a. past each other
b. towards each other
c. away from each other
d. next to each other
______ 9. Each cycle of spreading and intrusion of magma during seafloor spreading results in _____
a. magnetic reversals
b. new ocean crust
c. subduction
d. plates colliding
______ 10. Features found at divergent boundaries include _____
a. ocean ridges
b. deep-sea trenches
c. crumpled mountains
d. island arc volcanoes
______ 11. Continental-continental plate collisions produce _____
a. island arcs
b. rift valleys
c. deep-sea trenches
d. very tall mountain ranges
______ 12. Crust is neither destroyed nor formed by which of the following boundaries?
a. convergent
b. divergent
c. transform
d. magnetic
______ 13. The driving forces of tectonic plates are related to convection currents in Earth’s _____
a. crust
b. mantle
c. inner core
d. outer core
______ 14. A vast, underwater mountain chain is called a(n) _____
a. deep-sea trench
b. ocean ridge
c. oceanic crust
d. ocean floor sediments
______ 15. Elongated, sometimes arc-shaped depressions in the seafloor is called a(n) _____. They are the deepest part of the
a. deep-sea trenches
b. oceanic crust
c. ocean ridge
d. ocean floor sediment
16. Listed below are the steps involved in the process of seafloor spreading. Sequence the steps in the correct order.
The seafloor contracts and sinks
Crust spreads along an ocean ridge and magma fills the gap that is created
New seafloor moves away from the ridge, cools, and becomes more dense than
the material beneath it
Hot magma which is less dense than surrounding material, is forced toward
the crust
New ocean floor forms as the magma hardens
17. Complete the table below.
Type of Boundary
Plates Involved
Direction of Movement
Resulting Feature or
Ocean Ridges & rift valley
Moving apart
Rift valley
Toward one another
Deep-sea trench
volcanic island arc
Volcanic mountain range
Uplifted mountain range
Toward one another
Oceanic-oceanic and
Slide past one another
Match the letter that appears in the diagram with the appropriate feature listed below.(A-G)
18. ____________trench
19. ____________ mountain range
20. __________mid-ocean ridge
21. ____________ volcanic island arc
22. __________ volcanic mountain range
24. ____________subduction zone
Match the boundary with its name. (1-5)
25. _________divergent boundary
27. _________convergent: oceanic-oceanic
23. ____________ rift valley
26. _________transform boundary
28. _________ convergent: oceanic-continental
29. _________convergent: continental-continental
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