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GEOL1100
Exam 2 - Chptrs. 2,3,4,6,7
10
Geology
Undergraduate 1
10/28/2010

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Cards

Term
Four main branches of geophysics
Definition
1. Seismic wave
2. Gravity
3. Heat flow
4. Magnetic field
Term
__ % of Earth's surface is covered by oceans
Definition
70%
Term
Where did oceans originate?
Definition
Primarily from volcanic degassing of water vapor from interior of the primordial Earth. A small amt may have come from comets impacting earth.
Term
How can we sample sea floor rocks and sediments?
Definition
Rock dredges, seafloor drilling, submersibles
Term
Active continental margins
Definition
have continental shelves and slopes. Slopes lead to deep oceanic treanch
Term
Mid-oceanic ridge
Definition
encircles globe. Runs down center of an ocean & numerous conical seamonts rise from sea floor
Term
Continental shelves
Definition
seaward sloping (o.1 degree). few km to >500km. Covered in young sediment
Term
Continental slope
Definition
Steep slope (4-5 degree) extending from edge of continental shelf to deep sea floor
Term
Submarine canyons
Definition
V-shaped valleys that run across continental shelves & down slopes. Deliver continental sediments to abyssal fans on deep sea floor sometiems by turbidity currents
Term
Continental rises
Definition
gently seaward sloping (0.5 degree) wedges of sediment extending from base of slope to deep sea floor. Ending in abyssal plains at 5km. Lie upon oceanic crust. Sediment deposited by turbitdity & contour currents
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