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OCS 1005 EXAM 1 NEWEST ACTUAL / QUESTIONS
WITH 100% CORRECT ANSWERS VERIFIED /GRADED A+
which margin is where here is earthquake and volcanic activity. Faces a convergent boundary. What is an example? - - --Answers---Active Margin, Narrow Continental shelf
which margin has little earthquake activity. Faces a divergent plate boundary, has a broad continental shelf. What is an example? - ---Answers---Passive, atlantic ocean
the submerged extension of a continent - ---Answers--- continental shelf
abrupt transition from the continental shelf to continental slope - ---Answers---shelf break
the transition between the continental shelf and the deep ocean - ---Answers---continental slope
formed by the accumulation of sediments at the base of the continental slope and only occurs as passive margins - --- Answers---rise
Turbulence mixes sediment from the bottom into the water above a sloping bottom and this now denser mixture is pulled downhill by gravity, cutting the canyon - ---Answers--- turbidity currents 1 / 3
Where are continental rises only found? - ---Answers--- Passive margins
Why does the continental shelf in the Gulf of Mexico have numerous pits or pockmarks? - ---Answers---The Mississippi river and other rivers have deposited large amounts of sediment on the shelf. The weight of the sediments causes salt domes to rise and spread out, the dissolve and collapse.causing the pits
What is important about the pockmarks and pits of the Gulf of Mexicos continental shelf? - ---Answers---They cause oil and gas deposits to rise towards the surface and be more accessible.
Where are ridge systems found? - ---Answers---At spreading centers (divergent boundaries)
How do the rates of spreading in the Pacific and Atlantic differ?
- ---Answers---The Mid Atlantic ridge has more pronounced
mountains and valleys in it's bathymetry. It has a slower spreading rate and so it's features are more compact around the spreading center.
How does the rate of spreading affect the bathymetry? - --- Answers---Sediment accumulation will smooth out the bathymetric features and it is more pronounced with greater 2 / 3
distance from the spreading center because there has been a longer amount of time for sediments to accumulate.Slower- more contour Faster- smooth
Who discovered hydrothermal vents? - ---Answers---Jack Corliss
Cold ocean water is seeping through fissures in the crust.When the water comes close to the magma chamber, it is warmed, then rises and boils out of the fissures near the center of the rift zone - ---Answers---cycle of hydrothermal vents
Where does the Mid-Atlantic ridge cross land? What are the characteristics of this area? - ---Answers---Iceland. The area is characterized by hydrothermal activity and volcanic activity
Abyssal Plains: why do they appear to be relatively smooth &
featureless? - ---Answers---sediment accumulation
What is the relationship between sediment accumulation and increased distance from a ridge system/spreading center? - -- -Answers---The farther away that it is from a spreading center, the smoother it will be
How much of the Earth surface do the abyssal plains cover? - ---Answers---1/4
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