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geo directory

Some of these questions must be answered by consulting your textbook which correlates with the video series.  Consult: "Physical Geology -Earth Revealed" by Carlson, Plummer and McGeary; published by McGraw Hill, New York City, NY


 4. The Sea Floor 
The mysteries of the ocean floor lie hidden under enormous pressure and total darkness. This program looks at the research submersibles and indirect methods used to study the bottom of the sea, providing a glimpse of volcanic activity, formations such as the continental shelf and mid-ocean ridges, and life forms that thrive at extreme depths.

Video:  What are conditions like on the sea floor?

What % of the earth's crust is covered by water? p. 51

Video:  Name the major regions of the sea floor.

Video:  What is the flattest region of the sea floor?

What is the difference between an active and passive continental shelf (margin)? p. 54

Video:  Where are submarine canyons formed?

Video:  What are large submarine volcanoes called?

Continental shelves are now some 600 feet below sea level.  When are they believed to have been mostly exposed as dry land? p. 56

What is a turbidity current? p. 57

Video:  Regarding deposits on the sea floor.  What are terrigenous sediments?

Video:  Regarding deposits on the sea floor.  What are pelagic sediments?

Video:  Where does most undersea volcanic activity occur?

Describe the solid rock beneath the sediments of the abyssal plains. p. 59

Where is the rift valley? p. 61

Video:  Compare the age of the ocean crust to the age of continental crust.

Video:  What is a deep sea trench?

Video:  What natural resources are associated with the continental shelf?

Video:  Where would one find manganese nodules?  Why aren't these being mined?

Video:  What types of potential resources are being deposited near hydrothermal vents?

What are guyots and how are they believed to have formed? p. 65

What are atolls and how are they believed to have formed? p. 65

link to the answers (after assignments are handed in)