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Hace 3 días · Stonehenge is a prehistoric megalithic structure on Salisbury Plain in Wiltshire, England, two miles (3 km) west of Amesbury. It consists of an outer ring of vertical sarsen standing stones, each around 13 feet (4.0 m) high, seven feet (2.1 m) wide, and weighing around 25 tons, topped by connecting horizontal lintel stones.
Hace 3 días · Stonehenge, prehistoric stone circle monument, cemetery, and archaeological site located on Salisbury Plain, about 8 miles (13 km) north of Salisbury, Wiltshire, England. It was built in six stages between 3000 and 1520 BCE, during the transition from the Neolithic Period to the Bronze Age.
Hace 3 días · Most of the surviving 45 original bluestones of Stonehenge are of spotted dolerite (also called diabase) from southwest Wales, specifically the Preseli Mountains. Other stones of rhyolite, rhyolitic tuff, volcanic ash, and dolerite are believed to be from the same region.
Hace 4 días · Gemstone, any of various minerals highly prized for beauty, durability, and rarity. A few noncrystalline materials of organic origin (such as pearl and amber) also are classified as gemstones. Of the more than 2,000 identified natural minerals, fewer than 100 are used as gemstones and only 16 have achieved importance.
Hace 2 días · Thermally altered rock (heated stones) are easily identifiable in the archaeological record. Stone-boiling and pit-baking were common techniques which involved heating large pebbles then transferring the hot stones into a perishable container to heat the water.
Hace 22 horas · On June 17, 2024, a video shared by @renca_nativa showcased crab spiders, also known as Opiliones, found beneath a large stone at Cerro Renca, Santiago, Chile. Despite their spider-like appearance ...
Hace 4 días · The boundary stones used to be in the middle of nowhere. In the 1700s, Washington, D.C. was just an idea — an imagined street grid of grand avenues and squares to be built over what was then a ...
