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In the past, waste was simply left in piles or thrown into pits (known in archeology as middens). Landfills take up a lot of land and pose environmental risks. Some landfill sites are used for waste management purposes, such as temporary storage, consolidation and transfer, or for various stages of processing waste material, such as sorting ...
Concrete, as the Romans knew it, was a new and revolutionary material. Laid in the shape of arches, vaults and domes, it quickly hardened into a rigid mass, free from many of the internal thrusts and strains that troubled the builders of similar structures in stone or brick. [22]
The Mousterian (or Mode III) is an archaeological industry of stone tools, associated primarily with the Neanderthals in Europe, and to the earliest anatomically modern humans in North Africa and West Asia. The Mousterian largely defines the latter part of the Middle Paleolithic, the middle of the West Eurasian Old Stone Age.
This is an accepted version of this page This is the latest accepted revision, reviewed on 24 December 2024. Water located beneath the ground surface An illustration showing groundwater in aquifers (in blue) (1, 5 and 6) below the water table (4), and three different wells (7, 8 and 9) dug to reach it. Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in ...
The first published picture of a hand axe, drawn by John Frere in the year 1800. Flint hand axe found in Winchester. A hand axe (or handaxe or Acheulean hand axe) is a prehistoric stone tool with two faces that is the longest-used tool in human history. [1]
Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.
The Stonewall riots (also known as the Stonewall uprising, Stonewall rebellion, Stonewall revolution, [3] or simply Stonewall) were a series of spontaneous riots and demonstrations against a police raid that took place in the early morning hours of June 28, 1969, at the Stonewall Inn, in the Greenwich Village neighborhood of New York City.
The original SPR used an early PRI flip-up front sight with an elevation dial, which has since been discontinued. The Mk 12 MOD 0/H uses the current PRI flip-up front sight. The SPR/A, SPR/B, and Mk 12 MOD 1 use the KAC rail forend flip-up front sight, KAC part number 99051. The SPR and Mk 12 MOD 0/H use the ARMS #40 flip up rear sight.