Movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity These boundaries mark the collision between two of the planet's tectonic platesĬurved chain of volcanic islands located at a tectonic plate margin ( at the edge).Ī type of fault that moves away from each other horizontally. Two (or more) tectonic plates or fragments of the lithosphere move toward one another and collide. Two tectonic plates that are moving away from each other
Hypothetical supercontinent that included all current land masses, believed to have been in existence before the continents broke apart during the Triassic and Jurassic Periods. Mountain or hill,having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been eruptedĪ major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur. The layer of granitic, sedimentary and metamorphic rocks which form the ocean floors The upper layer of the earth's mantle, below the lithosphere Theory explaining the structure of the earth's crust The formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridgesīranch of geophysics concerned with magnetism in rocks
Linear zone where the Earth's crust and lithosphere are being pulled apart The assembly of most or all of Earth's continental blocks or cratons to form a single large landmassĪn underwater mountain range, formed by plate tectonics.
A theory that explained how continents shift position on Earth's surface.
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