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plate movement
| Term | Definition |
|---|---|
| crust | he hard, outermost layer or surface covering of an object |
| mantle | something that blankets over something else |
| outer core | a liquid layer, approximately 2,200 km (1,367 miles) thick, composed mainly of iron and nickel, located between Earth's mantle and inner core |
| inner core | a 2,200 km thick liquid layer of iron and nickel responsible for the magnetic field. |
| latitude | the measurement of distance in degrees north or south of the Equator, |
| longitude | Longitude is the measurement of east-west position on Earth, |
| oceanic ridge | a continuous, seismic, underwater mountain system, typically 2,500m deep, formed |
| sea floor | a geological process where tectonic plates pull apart at mid-ocean ridges, allowing magma to rise from the mantle, harden, and create new oceanic crust. |
| divergent boundary | a linear, constructive feature where two tectonic plates move apart from each other. |
| transform boundary | a geological process where one of Earth's tectonic plates sinks beneath another into the mantle at a convergent |
| subduction | the geological process where one tectonic plate is forced beneath another into the Earth's mantle |
| ocean trench | a long, narrow, V-shaped depression in the ocean floor that represents the deepest parts of the ocean |
| tectonic plate | massive, rigid slabs of solid rock composing Earth’s outer shell, known as the lithosphere. |
| lithosphere | the solid, rigid outer shell of the Earth, consisting of the crust and the topmost part of the upper mantle. |
| fracture | a number expressed as a ratio of two integers—a numerator over a denominator—rather than a decimal. |
| elasticity | the ability of a material, body, or economic variable to return to its original shape, size, or state after being deformed, stretched, or influenced by a change in conditions. |
| stress | the body’s natural, automatic reaction to challenges, demands, or threats. |
| strain | injury to a muscle (often caused by overuse); results in swelling and pain. |
| plate boundary | the edges where Earth's tectonic plates meet |
| continental | the thin, dense, and young outer layer of Earth’s lithosphere that forms the floor of the ocean basins. |
| ocean crust | the thin, dense, and young outermost layer of Earth’s lithosphere, typically 5–10 km thick, that underlies the |
| friction | a force that slows things down or stops them from moving when two surfaces rub together. |
| rift valley | a linear, steep-sided lowland formed where Earth's tectonic plates diverge (pull apart), causing the crust to sink |
| oceanic ridge | A continuous, under mountain system formed at mid-ocean ridges causing tectonic plates to slowly move apart. |