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Obsidian hydration dating (OHD) is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian.. Obsidian is a volcanic glass that was used by prehistoric people as a raw material in the manufacture of stone tools such as projectile points, knives, or other cutting tools through knapping, or breaking off pieces in a controlled manner, such as ...
Obsidian hydration dating is a method that allows for the absolute or relative dating of an obsidian sample. The degree of hydration (i.e., water absorbed into the material) observed indicates how long it has been since the obsidian surface was exposed (i.e., through flaking). Obsidian hydration dating is at times, however, unreliable.
Finally, water vapor pressure may also affect the rate of obsidian hydration. If the rate of obsidian hydration band can be controlled for the obsidian's geochemistry (e.g., the "source"), temperature (usually approximated using an "effective hydration temperature" or EHT coefficient) and other factors, it might be possible to date an artifact ...
Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.
First constructed in 2018, the Hino 300 PUV is available as a Class II with bodywork by Sta. Rosa, [20] Centro, [21] and Hino Philippines, [22] with a capacity of 23 passengers seated and standing. A Class III version is available by Centro, [ 23 ] and Hino Philippines, with 23-25 passengers all seated in a 1+2 abreast, or 2+2 abreast ...
Fury RR (New Breed, 2015–2022) - 4-stroke 125cc - Mag wheel version plus rear disc brake, and manual hand clutch; Curve(2009-2015) - 4-stroke 112cc - With electric starter scooter model; Barako (2004–2012) - 4-stroke 177cc - Business model, available with Kick starter only model / Electric + Kick starter model Tough and Powerful (2007)
Philippines portal Wikimedia Commons has media related to Female models from the Philippines . This category is for articles about female models from the Asian country of the Philippines .
Bench was established in 1987 by Ben Chan.Its first outlet was a small store selling men's t-shirts [1] in an outlet of the SM Department Store (now SM Store). [2] In 1991, Bench released its first television commercial featuring Filipino actor Richard Gomez as its endorser which set a standard on how the brand is promoted by its celebrity endorsers.