10 terms

Ch.14- The Ocean Floor- Quiz 2/2

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abyssal plain
Very level area of the deep-ocean floor, usually lying at the foot of the continental rise.
seamount
An isolated volcanic peak that rises at least 1000 meters above the deep-ocean floor.
mid-ocean ridge
A continuous elevated zone on the floor of all the major ocean basins and varying in width from 1000 to 4000 kilometers; The rifts and crests of ridges represent divergent plate boundaries.
seafloor spreading
The process by which plate tectonics produces new oceanic lithosphere at ocean ridges.
terrigenous sediment
Seafloor sediment derived from eroded rocks on land.
biogenous sediments
Seafloor sediment of biological origin, such as shells and skeletons of marine life.
calcareous ooze
Thick, common biogenous sediment produced by dissolving calcium carbonate shells.
hydrogenous sediment
Seafloor sediment consisting of minerals that crystallize from seawater; An important example is manganese nodules.
gas hydrates
A gas, such as methane, trapped in a lattice-like structure of water molecules.
manganese nodules
Rounded lump of hydrogenous sediment scattered on the ocean floor, consisting mainly of manganese and iron and usually containing small amounts of copper, nickel, and cobalt.