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Crustal Plates

(sections of the Earth's crust that move)

Crustal Plates are sections of the Earth's crust that shift, earthquakes often being the settling of plates that have been stretched from shifting in relation to neighboring plates. The (well-accepted) theory that the Earth's crust has this property is Plate Tectonics.

The question of whether plate tectonics is a factor on other worlds (Moons, planets, Extra-Solar Planets) is of interest, both simply to understand the planet/moon, and because on Earth, plate tectonics appears to be part of the Earth's system that maintains a life-supporting climate, i.e., its presence may be a factor in whether an exoplanet could support life anything like Earth's.