Featured News. Greens Sand has been in the silica sand industry since 1979 and has been a distributor of specialised silica sand to the Industrial as well as Leisure market for over 30 years, distributing nationally and across borders. We store a wide range of grades of silica sands.
Standing almost due east of the Reflecting Pool and the Lincoln Memorial, the monument, made of marble, granite, and bluestone gneiss, is both the world's tallest stone structure and the world's tallest obelisk, standing 555 feet 7 11â32 inches (169.351 m) tall.t the time of its completion, it was the tallest building in the world, a title it retained until the Eiffel Tower was completed in 1889; however, the Washington Monument is still the tallest stone structure in the world.
A tipi (also tepee or teepee) is a conical tent, traditionally made of animal skins upon wooden poles. A tipi is distinguished from other conical tents by the smoke flaps at the top of the structure.Historically, the tipi was designed and largely used by Indigenous people of the Plains in the Great Plains and Canadian Prairies of what is now North America. typical family tipi is a conical, portable structure with two adjustable smoke flaps, multiple poles (historically from 12 to 25 feet long) called lodge poles.