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  2. Van der Meer formula - Wikipedia

    en.wikipedia.org/wiki/Van_der_Meer_formula

    Δ = relative density of the stone (= (ρ s-ρ w)/ρ w) where ρ s is the density of the stone and ρ w is the density of the water d n50 = nominal stone diameter α = breakwater slope P = notional permeability S = Damage number N = number of waves in the storm ξ m = the Iribarren number calculated with the Tm

  3. Ceremonial stone landscape - Wikipedia

    en.wikipedia.org/wiki/Ceremonial_stone_landscape

    "whether these stone structures are massive or small structures, stacked, stone rows, or effigies, these prayers in stone are often mistaken by archaeologists and State Historic Preservation Officers (SHPOs) as the efforts of farmers clearing stones for agricultural or wall building purposes"

  4. Hudson's equation - Wikipedia

    en.wikipedia.org/wiki/Hudson's_equation

    Hudson's equation, also known as Hudson formula, is an equation used by coastal engineers to calculate the minimum size of riprap (armourstone) required to provide satisfactory stability characteristics for rubble structures such as breakwaters under attack from storm wave conditions.

  5. The Twelve Apostles (Victoria) - Wikipedia

    en.wikipedia.org/wiki/The_Twelve_Apostles_(Victoria)

    In July 2005, a 50-metre-tall (160 ft) stack collapsed, leaving eight standing at the Twelve Apostles' viewpoint. [2] Due to wave action eroding the cliffs, existing headlands are expected to become new limestone stacks in the future. [5]

  6. Rock balancing - Wikipedia

    en.wikipedia.org/wiki/Rock_balancing

    Rock balancing (also stone balancing, or stacking) is a form of recreation or artistic expression in which rocks are piled in balanced stacks, often in a precarious manner. Conservationists and park services have expressed concerns that the arrangements of rocks can disrupt animal habitats, accelerate soil erosion, and misdirect hikers in areas ...

  7. Cairn - Wikipedia

    en.wikipedia.org/wiki/Cairn

    Stacked rock features have been noted to have religious significance to the Klamath and Modoc Tribes of indigenous people of the Western United States, the respective tribes prohibiting photography of or touching the stone formations. These cairn-like structures are noted to be constructed for ritual and prayer purposes.

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