Exam 13: Divergent Boundaries

Approximately what percentage of the Earth's surface consists of deep-ocean basins?

Which ship was involved in the first global, comprehensive study of the Earth's oceans starting in 1872?

What rock would you expect to find associated with a mid-ocean ridge?

Discuss how oceanic crust forms.What process generates the necessary magma? Also, be sure to discuss ophiolite sequences and discuss how the formation of each layer contributes to the formation of the crust.

How are sound waves used to detail the shape of the seafloor?

What are the two types of continental margins?

What is the definition of a turbidity current?

A(n)________ forms when sediments from the ocean floor and pieces of oceanic crust are scraped from a subducting oceanic plate and adhere to an overriding tectonic plate.

What kind of subduction occurs when younger, warmer, less-dense lithosphere dips under another plate at shallower angles because it is too buoyant to sink?

Which of the following choices represents a rate of seafloor spreading commonly associated with a ridge such as the Mid-Atlantic Ridge?

What submarine oceanic features are circled in this image?

What feature is present in this image?

What is the speed of sound waves in water?

Which of the following groups contains all three major topographic provinces oceanographers use to define the seafloor?

Which part of a passive continental margin is built up by repeated deposition from turbidity currents?

Give a location of where one might find the continental margin in this image.

What happened when the spreading center that generated the Farallon plate collided with the North American plate?

Which of the following locations displays a triple junction that resulted from a rising mantle plume?

Assume the Mid-Continental Rift were to reactivate and divergence were to occur.What sequence of events would unfold as rifting began and what would eventually happen to the landmass?

Which process, common near black smokers, will use hot water circulating through the crust to alter olivine and pyroxene into chlorite and serpentine?