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(Silicon dioxide also known as silica from latin silex meaning flint stone) in water.Chemically, Obsidian closely resembles granite and rhyolite but the processes which lead to the formation of Obsidian are different to those which shape granite.Rhyolitic means eruptions from volcanoes which have highly viscous, silica-rich lava.These can be found in many places around the world including Mexico, North America, Armenia, Turkey, Italy, Greece and Scotland.There, the trees and their resins became covered with sediment, and over millions of years the resin hardened into amber.Although many amber deposits remain in ocean residue, geological events often repositioned the amber elsewhere.Other examples of non vertical superposition would be modifications to standing structures such as the creation of new doors and windows in a wall.Superposition in archaeology requires a degree of interpretation to correctly identify chronological sequences and in this sense superposition in archaeology is more dynamic and multi-dimensional.

The source of the heat was most likely energy coming from the decay of short-lived radioisotopes (half-lives less than a few million years) that were present in the newly formed solar system, especially Fe, although heating may have been caused by impacts onto the asteroids as well.Unlike other types of fossils, amber fossils are three-dimensional, with life-like colors and patterns.Even the internal structures of cells may be intact.This is important to stratigraphic dating, which assumes that the law of superposition holds true and that an object cannot be older than the materials of which it is composed.The law was first proposed in the 17th century by the Danish scientist Nicolas Steno.

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For access to the comments, please check your e-mail and click the link to Activate Your Account. Alfred covers for him while Nightwing and Robin patrol Gotham City in his stead. After Flashpoint Paradox (which is one of the best DCU films), it has just been going downhill and not stopping.

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