3.) List four facts that characterize the oceanic ridge system. Four facts that characterize the oceanic ridge system are: firstly, it represents 20 percent of Earth’s surface, the oceanic ridge system winds through all major ocean basin like the seams on a baseball. Ridges vary in width from 600 miles to 2500 miles. The mid-ocean ridge represents an area where, lithospheric plates move apart and new crust is created by magma pushing up from the mantle . Also, the mid-ocean ridge system is an example of a divergent plate boundary.
4.) Briefly describe the process of continental rifting. Where is it occurring today? As crust is pulled apart, rifts are formed and eventually become large enough for ocean to form. This is occurring today in the East African rift.
2.) Compare a continental volcanic arc and volcanic island arc. In a continental volcanic arc mountains formed in part by igneous activity associated with subduction of oceanic lithosphere beneath a continent. In contrast, volcanic island arc is a chain of volcanic islands generally located a few hundred kilometers from a trench where active subduction of one oceanic slab beneath another is occurring. Page 334
1.) What is the age of the oldest sediments recovered using deep-ocean drilling? How do the ages of these sediments compare to the ages of the oldest continental rocks? The age of the oldest sediments recovered using deep-ocean drilling is 180 million years. The age of these sediments compare to the ages of the oldest continental rock by 4 billion years of age. 2.) Assuming that hot spots remain fixed, in what direction was the Pacific plate moving while the Hawaiian islands were forming? When Suiko Seamount was forming? The Pacific Plate was moving north-west while the Hawaiian islands were formed.When the Suiko Seamount was formed the pacific plate was moving north-west also.
1.) What is an earthquake? Under what circumstances do most large earthquakes occur?...
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