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Ocean floor
Earth Science
| Question | Answer |
|---|---|
| Continental shelf | begins at the continental shelf break, connects the continental shelf and the oceanic crust, turbidity currents, Submarine canyons, Slope from 5˚ to 25˚ |
| continental shelf break | where the bottom sharply drops off into a steep slope (the drop off) |
| turbidity currents | bottom currents that carry lots of sediment |
| Continintal rise | currents flow along continental shelf and down continental slope, pick up and deposit sediments just below. sediments accumulate to form the large, gentle slope of the continental rise |
| Seamounts | isolated volcanic mountains scattered across the ocean floor |
| Seamounts (facts) | often form islands, very rarely cause earthquakes, different from island arcs |
| Abyssal Plain | a huge flat area (the sea floor) |
| Sea floor spreading | volcanic action and a mid-ocean ridge where some of the lava has cooled |
| Abyssal Plain (facts) | covered by a layer of sediment, Sea floor spreading occurs here, Some sea mounts, and black smokers, but mostly flat and featureless |
| Hydrothermal vents | holes in the seafloor where fluid heated by magma erupts |
| Mid-Ocean Ridge System | Mountain ranges under the ocean that form an almost continuous mountain belt that extends from the Arctic Ocean to North America |
| Mid-Ocean Ridge System (facts) | The largest tectonic feature on the earth, Has a central rift valley between the ridges, Shallow earthquakes occur along central rift, Hydrothermal Vents are located along ridges |
| Island Arcs | curving series of volcanic islands that are created through the collision of oceanic tectonic plates |
| Island Arcs (facts) | Subduction happens at these plate boundaries making island arcs, chains of volcanically active islands that parallel deep-sea trenches, Almost all basaltic volcanoes |
| Subduction | the process by which collision of the earth's crustal plates results in one plate's being drawn down or overridden by another, localized along the juncture (subduction zone) of two plates. |
| Continental Shelf | a shallow extension of that landmass that surrounds nearly all continents |
| Continental Shelf (facts) | The Atlantic shelf is much wider because it is a passive margin, while the Pacific is very narrow because it is an active margin. |
| Trenches (facts) | A trench marks the position at which one plate begins to go under another plate (subduction). They usually form a volcanic arc (Ring of Fire). |
Created by:
elarocco
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