Word:

plate tectonics

n.1.(Geol.) A geological theory which holds that the crust of the earth (the lithosphere) is divided into a small number of large separate plates which float and move slowly around on the more plastic asthenosphere, breaking apart and moving away from each other at points where magma upwells from below, and, driven by such upwellings and other currents on the athenosphere, sliding past each other, colliding with each other, and in some cases being submerged (subducted) one below the other. This theory is now widely accepted, and explains many geological phenomena such as the clustered locations of earthquakes, mountain building, volcanism, and the similarities observed between the geology of continents, such as South America and Africa which are now far apart, but, according to the theory, were once joined together. The motions of such tectonic plates are very slow, typically only several centimeters per year, but over tens and hundreds of millions of years, cause very large changes in the relative positions of the continents. The consequence of such movement of plates is called continental drift.
Noun1.plate tectonics - the branch of geology studying the folding and faulting of the earth's crust
geomorphology, morphology, Pangaea, Pangea, plate tectonic theory, tectonics
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Plate
plate armor
plate armour
Plate bone
Plate girder
plate glass
plate iron
Plate layer
Plate mark
Plate paper
Plate press
Plate printer
Plate printing
plate rack
plate rail
plate tectonic theory
-- plate tectonics --
Plate tracery
Plate wheel
Plate-gilled
Plateau
plateau striped whiptail
Plateful
Platel
platelayer
platelet
plateletpheresis
platelike
Platen
Plater
Plateresque
Plates
Platetrope
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