Convectioncurrent		Chain of volcanic islands formed along an ocean trench
Terrane		Movement of the ocean floor away from either side of a mid-ocean ridge
Platetectonics		Material that makes up the ocean floor
Oceaniccrust		Piece of land with a geologic history distinct from that of the surrounding land
Divergentboundary		Movement in a fluid caused by uneven heat
Panthalassa		Material that makes up landmasses
Continentalcrust		Thin outer shell of the earth consisting of the crust and the ridge upper mantel
Continentaldrift		System of undersea mountain ranges that wind around the earth
Seafloorspreading		Undersea mountian range with a steep, narrow valley along its center
Asthenosphere		Theory that the lithosphere is made up of plates that float on the asthenosphere
Oceantrench		Region where one lithosphere plate moves under another
Subductionzone		Steep, narrow valley formed as lithospheric plates seperate
Pangaea		Transfer of heat through the movement of a fluid material
Convection		Hypothesis stating that the continents once formed a single landmass
Convergentboundary		Boundary formed by two lithospheric plates that are moving apart
Islandarc		Single landmass thought to have been the origin of all continent
Lithosphere		Giant ocean surrounding Pangaea
Riftvallley		Border formed by the direct collision of two lithospheric plates
Midatlanticrigde		Zone of mantel beneath the lithosphere that consists of slowly flowing solid rock
Midoceanridges		Deep valley in th ocean floor that forms along a subduction zone