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Physicist: The narrative that usually leads to this question is something like: “It was the Wright brother’s brilliant wing shape, among other design innovations, that first made manned flight possible”.So if the wing shape is so important, why does it still work if it’s flipped upside-down?Other subdivisions reflect the evolution of life; the Archean and Proterozoic are both eons, the Palaeozoic, Mesozoic and Cenozoic are eras of the Phanerozoic eon.The three million year Quaternary period, the time of recognizable humans, is too small to be visible at this scale.A wing (or airfoil or whatever) creates lift by taking advantage of a combination of the Bernoulli force and “angle of attack”.By increasing angle of attack (tilting the nose up) the oncoming wind hits the bottom of the wing more, and pushes the plane up.The first three of these can be referred to collectively as the Precambrian supereon.Eons are divided into eras, which are in turn divided into periods, epochs and ages.
The reason that fires always flow upward is that its density is lower than air.If you were on a planet with no air at all, fire would fall to the ground instead of rise because, like all matter, it’s pulled by gravity.Also, it would be hard to keep the fire going (what with there being no air).The following four timelines show the geologic time scale.The first shows the entire time from the formation of the Earth to the present, but this gives little space for the most recent eon.
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So, fire rises in air for the same reason that bubbles rise in water: it’s buoyant.