OCS 1005 : The Ocean Floor Test 1
15 Mar 2019
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Document Summary
Fathom a unit of measure: 1. 8 meters (6 feet) 1925: lacked detail, may have provided an inaccurate view of the sea floor. Can go down about 6000 feet: unmanned submersibles, collection devices with video cameras, a lot cheaper, smaller, don"t have to allow for humans. Most ocean floor features are generated by plate tectonic processes. Topology of the deep ocean basins: here the sea floor is a blanket of up to 5 k (3 miles) thick overlying basaltic rocks. In places they project above the surface to form islands: easter island. Abyssal hills: small, sediment covered extinct volcanoes or intrusions of once molten rock, usually less than 200 meters (650 feet) high, poke through the sediment cover in the abyssal plain, much more abundant than seamounts. Pillow lave/pillow basalt: shapes formed when hot basaltic lava quickly cools after it comes up through oceanic ridges.
