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71chemical bonding — ▪ chemistry Introduction any of the interactions that account for the association of atoms into molecules, ions, crystals, and other stable species that make up the familiar substances of the everyday world. When atoms approach one another …
72Color temperature — The CIE 1931 x,y chromaticity space, also showing the chromaticities of black body light sources of various temperatures (Planckian locus), and lines of constant correlated color temperature. Color temperature is a characteristic of visible light …
73Plate tectonics — The tectonic plates of the world were mapped in the second half of the 20th century …
74RGB color model — RGB redirects here. For other uses, see RGB (disambiguation). A representation of additive color mixing. Projection of primary color lights on a screen shows secondary colors where two overlap; the combination of all three of red, green, and blue …
75Wakeboarding — is a surface water sport which involves riding a wakeboard over the surface of a body of water behind a boat. It was developed through a combination of water skiing, snowboarding and surfing techniques.The rider is towed behind a boat; typically… …
76New Delhi — This article is about the capital city of India which is a part of the greater metropolis of Delhi. For the greater metropolis, see Delhi. New Delhi नई दिल्ली   capital   …
77Wright brothers — Orville Wright Photo: 1903 Born August 19 …
78Tooth enamel — Labeled molar Latin enamelum Code TA …
79Quake 4 — Developer(s) Raven Software id Software Publisher(s) …
80Screw thread — Internal and external threads illustrated using a common nut and bolt. The screw and nut pair can be used to convert torque into linear force. As the screw (or bolt) is rotated, the screw moves along its axis through the fixed nut, or the non… …
