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3.2-4 Vocabulary

Convection in the Mantle, Continental Drift, Sea-floor Spreading

conduction the direct transfer of thermal energy (heat) from one substance to another substance that it is touching
continental drift the hypothesis that the continents slowly move across Earth's surface
convection the transfer of thermal energy (heat) by the movement of fluid
convection current the movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another
deep-ocean trench a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle
density the amount of mass of a substance in a given volume; mass per unit volume; mass/volume
fossil a trace of an ancient organism that has been preserved in rock
mid-ocean ridge an undersea mountain chain where new ocean floor is produced
Pangaea the name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
radiation the direct transfer of energy through space
sea-floor spreading the process by which molten material adds new oceanic crust to the ocean floor
sonar a device that determines the distance of an object under water by recording echoes of sound waves
subduction the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
Created by: anorris