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sea-floor spreading -- n. The process of adding to the Earth's crust at mid-ocean ridges as magma wells up and forces previously formed crust apart.
sediment -- Any solid material that has settled out of a state of suspension in liquid.
Sand, Sandstone, Schist, Sea-Floor Spreading, Sea-Level, Sedimentary Rock, Seismic, Seismic Wave, Seismograph, Shale, Shield, Shield Volcano, Silica, Silicate Magma, Silcrete, Sill, ...
Sea-Floor Spreading:
The process that occurs at mid-ocean ridges in which convection currents below pull the plates apart and create new sea floor.
Seamount:
A mountain on the sea floor that has at least 1000 meters of local relief.
 See also: Dissolve, Location, Weathering, Volcanic, Tectonic
  
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