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- 1. Multiple ChoiceMassive pieces of land that are part of the Earth's crust and upper mantleTectonic platesTrenchesDivergent boundaryContinental shelves
- 2. Multiple ChoiceThe deepest part of the ocean; long, narrow ditchesTectonic platesTrenchesDivergent boundaryContinental shelves
- 3. Multiple Choice___________ help explain why Earth is not getting any larger even though the tectonic plates are always moving.earthquakessubduction zonesfossilsvolcanoes
- 4. Multiple ChoiceThe OLDEST seafloor is located?Closest to the mid-ocean ridgeFarthest from the mid-ocean ridge
- 5. Multiple ChoiceTrue or False : Sea-floor Spreading adds new material to the ocean floor?TrueFalse
- 6. Multiple ChoiceWhat happens when Subduction occurs?Parts of the crust fall into the mantleParts of the crust fall into the coreParts of the crust fall into spaceNone of these
- 7. Multiple ChoiceTrue or false : Deep-Ocean Trenches are underwater canyons?FalseTrue
- 8. Multiple ChoiceWhat did scientists use to map the oceans floor?Echo-locationSonarSpace ShuttlesAnimals
- 9. Multiple ChoiceWhat are Mid-Ocean Ridges?A chain of underwater waterfallsA chain of underwater volcanosA chain of underwater mountainsA chain of underwater rocks
- 10. Multiple ChoiceWhat is one piece of evidence of seafloor spreading?scientist found animals at the bottom of the seamountain rocks crashed into the oceanscientist found pillow shaped rocks like pillows
- 11. Multiple ChoiceWhat process takes place at the trenches?divergent boundariessubductionnew crust is formedmountain ranges
- 12. Multiple ChoiceThe oceanic crust is pushed aside on both sides of theContinent's edgeDeep-ocean trenchMid-ocean ridge
- 13. Multiple ChoiceThe oceanic crust _________ when it reaches the continental crust.sinksrisesexpands
- 14. Multiple ChoiceNew crust is always formed at the...mid-ocean ridgedeep-ocean trenchasthenosphere
- 15. Multiple ChoiceIf there are MORE mid-ocean ridges than subduction zones, what happens to the ocean?It gets largerIt gets smallerIt sinks
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