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Other Sciences
6th -
9thgrade
Plate Tectonics and Sea-Floor Spreading Review
10 questions
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- 1. Multiple Choice
___________ help explain why Earth is not getting any larger even though the tectonic plates are always moving.
earthquakes
subduction zones
fossils
volcanoes
- 2. Multiple Choice
If there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?
It gets larger
It gets smaller
It sinks
Its size does not change
- 3. Multiple ChoiceWhat type of boundary moves side by side in opposite directions?ConvergentDivergentTransformInsurgant
- 4. Multiple ChoiceThe average density of one of the continental crusts is 2.8 g/cm3 and the average density of one of the oceanic crusts is 3.2 g/cm3. If these two plates came together, what could be expected to happen?The two plates would push apart and form a rift zone.The oceanic plate would rise up over the continental plate.The oceanic plate would be pushed under the continental plate.The two plates would meet head on and rise up to form mountains.
- 5. Multiple Choice
Sea-floor spreading states that new ocean crust is being formed constantly. Which of the following is also true?
The oceans are constantly getting bigger.
The amount of land on earth is constantly increasing.
The amount of land on earth remains the same due to subduction.
When the size of the crust reaches a certain amount, sea-floor spreading will stop.
- 6. Multiple ChoiceWhich of the following objects best represents the movement that occurs during sea-floor spreading?ElevatorConveyor beltRollercoasterHot air balloon
- 7. Multiple ChoiceWhat process is occurring at Z?Convection currentsSubductionTwo plates moving apartNew ocean floor forming
- 8. Multiple ChoiceWhy does the ocean floor sink beneath the continent at Z?The ocean floor is less dense than the continent.The ocean floor is more dense than the continent.The ocean floor is moving faster than the continent.The ocean floor is moving slower than the continent.
- 9. Multiple Choice
What do convergent (oceanic and oceanic) plates form?
Mountains
Rift valley
Subduction, Volcanoes, & Trenches
Mid-Ocean Ridges
- 10. Multiple ChoiceWhat do convergent (continental and continental) plates form?Volcanoes, subduction, trenchesRift valleyMid-Ocean RidgesMountains
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