continental drift - large scale horizontal movements of the continents, supercontinent - a hypothetical former large continent from which other continents are held to have broken off and drifted away, tectonic plates - scientific theory that explains how major landforms are created as a result of Earth's subterranean movements, superposition - the action of placing one thing on or above another, convection current - the movement caused with a fluid by the tendency of hotter, less dense material to rise, and colder material to sink, divergent boundary - a linear feature that exists between two plates that are moving away from each other, convergent boundary - a location on the lithosphere where two or more tectonic plates move towards each other, transform bounary - type of plate boundary where two plates slide past on another horizontally, ocean basin - a depression of the earth's surface in which an ocean lies, subduction - the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate, seismic wave - an elastic wave in the earth produced by an earthquake , Richter scale - a measure of the strength of earthquakes, volcano - a mountain with a large circular hole earth the top through which lava, gases, steam and dust are or have been forced out, hot spot - region of the Earth's upper mantle that upwells to melt through the crust to form a volcanic feature, theory - a well-established explanation of some aspect of the natural world, continuous - goes on and on,

Plate tectonics

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