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Seafloor Spreading Multiple Choice Test

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Seafloor Spreading

Use your knowledge of Earth science to answer all questions in the data set. You will need your Earth Science reference tables and a calculator to answer some of the questions. Good Luck.

NOTE: If the question contains an image, clicking on it will enlarge it for easier viewing. If there is a "More Info" link after the question, clicking it will display additional content related to the question.

Crustal formation, which may cause the widening of an ocean, is most likely occurring at the boundary between the

Oceanic crust is sliding beneath the Aleutian Islands in the North Pacific Ocean, forming the Aleutian Trench at a

What would a study of the East Pacific rise (a mid-ocean ridge) indicate about the age of the basaltic bedrock in this area?

Which inference can best be made from the diagram?

As distance from the center of the ridge increases, the age of the rocks

According to the diagram, what is the approximate rate of seafloor spreading?

The occurrence of high-heat floors at the ridge center provides evidence of the

Which cross-sectional diagram of a portion of the crust and mantle best shows the pattern of mantle convection currents that are believed to cause the formation of a mid-ocean ridge?

Mid-ocean ridges (rifts) normally form where tectonic plates are

According to the diagram, the deep trench along the west coast of South America is caused by movement of the oceanic crust that is

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