If plate tectonics stopped, the continents would stay in place rather than moving slowly around the face of the earth. This would also result in a reduction in volcanic activity and earthquakes. Lower volcanic activity c... More »

The Earth's crust is made up of a number of plates that sit on top of the mantle, which is made up of molten rock. The movement of these plates is called plate tectonics. Plate movement can, over time, cause mountains to... More »

Tectonic processes create new sediments as plates collide, move sediment as one plate slips past or overrides another, and ultimately transform sediment by accumulation or volcanic activity. Ocean sediments transfigure b... More »

Andrew Alden of About explains that Australian geologist Sam Carey's theory of Earth expansion, the idea that the continents fit together properly only on a formerly smaller Earth, once rivaled the theory of plate tecton... More »

Very slow currents in the relatively plastic lower mantle, or aesthenosphere, are thought to push the crustal plates along and drive the process of plate tectonics. These currents are caused by convection, with the mantl... More »

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The theory of plate tectonics, formerly known as continental drift, is a working model that describes the movement of the continents and sea floor across the surface of the Earth. The theory explains many anomalous facts... More »

Researcher Alfred Wegener developed the continental drift theory that led to the modern theory of plate tectonics. Because plate tectonics is still a theory, it is hypothesized and not officially discovered or proven. More »