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A bedrock mortar (BRM) is an anthropogenic circular depression in a rock outcrop or naturally occurring slab, used by people in the past for grinding of grain, acorns or other food products. [1] There are often a cluster of a considerable number of such holes in proximity indicating that people gathered in groups to conduct food grinding in ...
To perform a silent trade, one group of traders would go to a specific location, leave their trading goods and then withdraw to a distance. Then play a drum to signal the other traders that a silent trade was taking place. The other group of traders would then approach and inspect the goods (most commonly salt or gold). If the goods met with ...
Another type of metate called a grinding slab may also be found among boulder or exposed bedrock outcroppings. The upper face of the stone is used for grinding materials, such as acorns , that results in the smoothing of the stone's face and the creation of pocked dimples.
Residuum differs from saprolite through its structure and degree of weathering. Saprolite is commonly referring to weathered material retaining details or structural features of the bedrock. The distinguishing feature between these is that residuum no longer retains the structural features or details of its bed rock.
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure. [1]
Wandering atrial pacemaker may be seen in young, healthy individuals as well as in the elderly and those with lung disease. [2] The cause of wandering atrial pacemaker is unclear. Increased tone from the vagus nerve may factor into the rhythm appearing in young, healthy individuals who exercise. The vagus nerve is a part of the parasympathetic ...
Slabs are one of the greatest consumers of concrete in many buildings, [14] so reducing the slab mass can make a relatively large difference to the environmental impact of a building's construction. Biaxial slabs may be marginally cheaper than solid slabs, partly due to the lower mass.
The spawn (eggs) of a clownfish. The black spots are the developing eyes. Spawn is the eggs and sperm released or deposited into water by aquatic animals. As a verb, to spawn refers to the process of freely releasing eggs and sperm into a body of water (fresh or marine); the physical act is known as spawning. The vast majority of aquatic and ...