Sterling Cooley
@SterlingCooley • 27,516 subscribers
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This shows ~1,200 years of seawater erosion of the Khafre Pyramid, compressed into one minute. For the first ~500 years a high ocean stand holds about 300 ft above the base; its waves lap the soft Tura limestone casing and dissolve it (carbonic acid) at roughly 0.08 ft/year — about one inch of perpendicular recession annually, and ~14× faster than the slow dissolution on submerged surfaces below. As the sea recedes, it then pauses at successively lower stands, each held ~75–100 years, and each carves a distinct horizontal band where the casing is stripped to the bare core. Loosened blocks slough off at their own pace and fall down each face, piling into talus that mounds toward the center of all four sides. The smooth white cap above the highest waterline is never reached and survives intact.
Sterling Cooley634,848 次观看 • 7 天前
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