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2. Pavers (flooring) - Wikipedia

   en.wikipedia.org/wiki/Pavers_(flooring)

   Pavers manufactured from concrete go well with flag, brick and concrete walkways or patios. Concrete pavers may be used where winter temperatures dip below freezing. They are available in hole, x-shape, y-shape, pentagon, polygon and fan styles. An interlocking concrete paver, also known as a segmental paver, is a type of paver.

3. Stone spheres of Costa Rica - Wikipedia

   en.wikipedia.org/wiki/Stone_spheres_of_Costa_Rica

   The stones are believed to have been first created around the year 600 CE, with most dating to after 1000, but before the Spanish conquest. However, their age remains unknown as the only method available for dating the carved stones is stratigraphy, but most stones are no longer in their original locations which confuses that. If the stones ...

4. Roundness (geology) - Wikipedia

   en.wikipedia.org/wiki/Roundness_(Geology)

   For example, a soft claystone pebble will obviously round much faster, and over a shorter distance of transport, than a more resistant quartz pebble. The rate of rounding is also affected by the grain size and energy conditions. Angularity (A) and roundness (R) are but two parameters of the complexity of a clast's generalised form (F).

5. Carved stone balls - Wikipedia

   en.wikipedia.org/wiki/Carved_stone_balls

   A theory on the movement of megalithic stones for monuments has been put forward as a result of an observed correlation between standing stone circles and a concentration of carved stone balls. The suggestion is that the stone balls might have been used like ball bearings for transporting big stones. [11]

6. Nicolson pavement - Wikipedia

   en.wikipedia.org/wiki/Nicolson_pavement

   Laying the Nicolson pavement in Mercer St, New York, by E. & H.T. Anthony Patent Drawing of Nicolson's Pavement. Wood block pavement may have originated in Russia in the 14th century, but it gained prominence in the 1820s and 1830s as a road building alternative to the irregularly surfaced cobblestone streets common during that era. [2]

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8. List of stone circles - Wikipedia

   en.wikipedia.org/wiki/List_of_stone_circles

   Duddo Five Stones – 6 km (4 mi) south of the Scottish border, formerly known as the Four Stones. The Goatstones – a Bronze-age four-poster near the village of Wark on Tyne . Threestoneburn Stone Circle – a circle of 16 stones in Threestoneburn Wood, near the village of Ilderton .

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