Geo Chapter 1 2
Terms
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- portion of the seafloor adjacent to the contintents. it may include continental shelf, slope and rise
- continental margin
- the gently sloping surface at the base of the continental slope
- continental rise
- the glently sloping submerged portion of the continental margin, extending from the shoreline to the contiental slope
- continental shelf
- the steeep gradient that leads to the deep ocean floor and marks the seaward edge of the continental shelf
- continental slope
- the rigid outer layer of earth, including the crust and upper mantle
- lithosphere
- region in the upper mantel (beneath lithosphere) where rocks melt to form magma.
- asthenosphere
-
about 5 miles thick, composed mostly of basalt
high density - oceanic crust
-
about 5-40 miles thick, consists of many different rock types
low density - continental crust
- in any undeformed sequence of sedimentary rocks, each bed is older than the one above and younger than the one below
- law of superposition
- a rock or fault is younger than any rock or fault through which it cuts (whatever is cut is the older event)
- law of cross cutting relations
- time perid can be recognized by its fossil content
- law of faunal succession
- everything that happens today, we can assume happened in the past
- principle of uniformitariansim
- very level area of the deep ocean floor, usually laying at the foot of the continental rise
- abyssal plain
- the portion of the seafloor what lies between the continental margin and oceanic ridge system
- deep ocean basin
- a narrow elongated depression of the seafloor
- deep ocean trench