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- 1. Multiple Choice
Sea-floor Spreading is the theory that new sea floor is added at ________________
Mid-ocean trenches
Deep ocean trenches
Continents
- 2. Multiple Choice
What are Mid-Ocean Ridges?
A chain of underwater waterfalls
A chain of underwater volcanos
A deep canyon in the ocean floor
- 3. Multiple ChoiceThe OLDEST seafloor is located?Closest to the mid-ocean ridgeFarthest from the mid-ocean ridge
- 4. Multiple ChoiceTrue or false : Deep-Ocean Trenches are underwater canyons?FalseTrue
- 5. Multiple Choice
What is one piece of evidence of seafloor spreading?
scientist found animals at the bottom of the sea
expanding continents
scientist found pillow shaped rocks (made from lava)
- 6. Multiple Choice
Another piece of evidence for sea-floor spreading is the age of rocks. Choose the true statement about this evidence below:
The age of the oceanic crust gets older the further you go from a mid-ocean ridge.
The age of the oceanic crust gets younger the further you go from a mid-ocean ridge.
The age of the oceanic crust is the exactly the same no matter where you go.
- 7. Multiple Choice
Magnetic stripes in the oceanic crust are another piece of evidence that prove the ocean floor....
Was made at the same time
Has different ages throughout the floor (newer crust next to MOR)
Changes the magnetic poles of the earth
- 8. Multiple ChoiceThe oceanic crust is pushed aside on both sides of theContinent's edgeDeep-ocean trenchMid-ocean ridge
- 9. Multiple Choice
The oceanic crust _________ when it reaches the continental crust.
subducts (sinks)
rises
expands
- 10. Multiple ChoiceNew crust is always formed at the...mid-ocean ridgedeep-ocean trenchasthenosphere
- 11. Multiple ChoiceIf there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?It gets largerIt gets smallerIt sinks
- 12. Multiple ChoiceThe deepest part of the ocean; long, narrow ditchesTectonic platesTrenchesDivergent boundaryContinental shelves
- 13. Multiple Choice
___________ help explain why Earth is not getting any larger even though new oceanic crust is being added from mid-ocean ridges.
earthquakes
subduction zones
fossils
volcanoes
- 14. Multiple Choice
What happens when Subduction occurs?
Parts of the crust fall into the mantle at deep-ocean trench
Parts of the crust fall into the mantle at a mid-ocean ridge
Parts of the crust fall into space
- 15. Multiple Choice
How does sea floor spreading help prove continental drift?
It explains HOW the supercontinent of Pangea formed
It explains HOW the continents broke apart, due to the ocean floor pushed apart at a MOR (mid-ocean ridge)
It explains WHY the seafloor is shrinking & pulling the continent into deep ocean trenches
- 16. Multiple Choice
Why did no one believe Alfred Wegener when he claimed that there was a supercontinent - even though he had evidence such as coastlines fitting together & fossils?
He was not a scientist
He was one weird dude
He had nothing to support that they once fit together
He could not explain HOW the continents moved
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