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from article Oil sand
Tar sand deposits in Alberta. 1 mi = 1.6 km.
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from article Superacid
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from article Superacid
Hammett acidity function (H0) values for some solutions in 100% H2SO4. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)
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from article Superacid
Hammett acidity function (H0) values for acids of the fluorosulfuric acid solvent system. (After E. F. Caldin and V. Gold, eds., Proton Transfer Reactions, Chapman and Hall, 1975)
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from article Superacid
Hammett acidity function (H0) values for some HF−MF5 systems.
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from article Lightning
Charge distribution in storm clouds. (Credit: NOAA)
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from article Lightning
Natural cloud-to-ground lightning near Tucson, Arizona. Note that each discharge strikes the ground in more than one place. (Credit: Michael J. Leuthold)
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from article Lightning
Sprites, elves, and blue jets are transient luminous events in the upper atmosphere associated with thunderstorms. (Credit: NOAA)
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from article Material resource planning
Lumpy demand in manufacturing for three types of drills. The boxes represent equal time periods.
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from article Material resource planning
Flowchart for a model material resource planning system.
