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An earthquake creates distinct types of waves with different velocities.

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Seismometers are instruments that measure motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources such as by the use of explosives.

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Plasma and ionised gas have unique properties and display behaviors.

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Gravity waves are generated in the troposphere by frontal systems or by airflow over mountains. At first, waves propagate through the atmosphere without appreciable change in mean velocity. But as the waves reach more rarefied air at higher altitudes, their amplitude increases, and nonlinear effects cause the waves to break, transferring their momentum to the mean flow. This transfer of momentum is responsible for the forcing of the many large-scale dynamical features of the atmosphere. This momentum transfer is partly responsible for the driving of the Quasi-Biennial Oscillation, and in the mesosphere, it is thought to be the major driving force of the Semi-Annual Oscillation.

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Nitrogen is a chemical element with symbol N and atomic number 7.

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The Pythagorean theorem was known long before Pythagoras, but he may well have been the first to prove it. In any event, the proof attributed to him is very simple, and is called a proof by rearrangement. The two large squares shown in the figure each contain four identical triangles, and the only difference between the two large squares is that the triangles are arranged differently. Therefore, the white space within each of the two large squares must have equal area. Equating the area of the white space yields the Pythagorean theorem. That Pythagoras originated this very simple proof is sometimes inferred from the writings of the later Greek philosopher Proclus.

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Volt is the derived unit for the electric potential and electromotive force.

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Copper is one of the few metals that occur in nature in directly usable metallic form as opposed to needing extraction from an ore. In the Roman era, copper was principally mined on Cyprus.

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Platinum is one of the least reactive metals and is extremely rare.

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The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole. The original international prototype of the metre is still kept under the conditions specified in 1889.

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Chromium is a chemical element with symbol Cr and atomic number 24.

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Computational complexity is central to computational geometry, with great practical significance if algorithms are used on very large datasets containing tens or hundreds of millions of points.

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Quantum mechanics, including quantum field theory, is a branch of physics which is the fundamental theory of nature at the smallest scales of energy levels of atoms and subatomic particles.