marine bio chapter 2 test
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28 Terms
The continuous chain volcanic submarine mountains, where new sea floor is formed due to divergent plate boundaries
Mid ocean ridge
A Narrow deep depression in the sea floor were old lithosphere , oceanic crust is destroyed
Trench
The process by which new sea floor is formed as it moves away from the Mid ocean Ridge
Sea floor spreading
Regions of earth lithosphere that are broken up and move
Tectonic plates
The downward movement of a tectonic plate into the mantle when one plate dips below a less dense plate
Subduction
The boundary between two plates that move past each other
Shear/ transform boundary
The area where continental crust meets oceanic crust and is made up of various regions
Continental margin
The shallow gently slipping part of the continent that extends from the shore to the point where the slope gets steeper
Continental shelf
The steeper Seaward section of the continental margin
Continental slope
The area formed by sediment that is gently sloping area at the base of the continental slope
Continental rise
Where the slope of the continental self abruptly becomes steeper
Shelf break
4 worlds ocean basin
Pacific, Atlantic, Indian, Arctic
5 continental
1.light colored
Mostly granite
Less dense
Older then oceanic
Thicker
5 oceanic
1.Dark colored minerals
Basalt
Denser
Younger
Thinner
The earths crust destroyed
Deep ocean trenches
New crust created
Mid ocean ridges
Active
Steep, rocky shoreline, no Continental shelves and steep continental slopes.
West coast
Passive
Flat, wide continental Shelves, gradual, sloping, continental slopes
East coast
Pacific
Largest and deepest
Arctic
Smallest and shallowest
Souther hemisphere
80%
Divergent
Move away from each other
Convergent
Two plates collide
Transform/shear
Two plates move horizontally past each other
Oceanic oceanic
Island arcs
Oceanic and continental
volcanoes
Continental continental
Mountains
Evidence of plate tectonics
Magnetic anomalies, seafloor spreading, sediment accumulation, mid ocean ridges