Voia sa puna puntea mai repede ca sa plateasca vacanta in Canare. Dar abia acum s-a ciobit dintele, dupa vacanta ei.
Nu dau numele decat inceputul la prenume: Viol.
Sa merg la aceeasi sa puna puntea?
Solutia:
Asigurare dentara ca in China: platesc lunar dar opresc plata cand am probleme!
A invatat de la stramosii sai primitivi:
tools that require a sharp edge are made using
cryptocrystalline materials that fracture in an easily-controlled
conchoidal manner. Cryptocrystalline tool stones include
flint and
chert, which are fine-grained
sedimentary materials;
rhyolite,
basalt, and
felsite, which are
volcanic rocks; and
obsidian, a form of natural glass created by igneous processes. These materials fracture in a predictable fashion, and are easily resharpened. For more information on this subject, see
lithic reduction.
Coarse-grained materials, such as
granite and
sandstone, may also be used as tool stones, but for a very different purpose: they are ideal for
ground stone artifacts. Whereas cryptocrystalline materials are most useful for killing and processing animals, large-grained materials are usually used for processing plant matter. Their rough faces often make excellent surfaces for grinding plant seeds. With much effort, some large-grained stones may be ground down into
awls,
adzes, and
axes.
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[edit] See also