no visible porosity
61sample preparation — ▪ chemistry Introduction in analytical chemistry (chemistry), the processes in which a representative piece of material is extracted from a larger amount and readied for analysis. Sampling and sample preparation have a unique meaning and special …
62Preclinical imaging — is the visualization of animals for research purposes, such as drug development. Imaging modalities have long been crucial to the researcher in observing changes, either at the organ, tissue, cell, or molecular level, in animals responding to… …
63Adrastea (moon) — Infobox Planet name = Adrastea bgcolour = #a0ffa0 caption = Image of Adrastea taken by Galileo spacecraft between November 1996 and June 1997 discoverer = David C. Jewitt nowrap|G. Edward Danielson discovered = July 8, 1979 mean orbit radius =… …
64Earthquake — For other uses, see Earthquake (disambiguation). Global earthquake epicenters, 1963–1998 …
65Limestone — For other uses, see Limestone (disambiguation). Limestone Sedimentary Rock Limestone in Waitomo District, New Zealand Composition …
66Leather — For other uses, see Leather (disambiguation). Modern leather working tools Leather is a durable and flexible material created via the tanning of putrescible animal rawhide and skin, primarily cattlehide. It can be produced through different… …
67Metal — This article is about metallic materials. For other uses, see Metal (disambiguation). Some metal pieces Metals Alkali metals …
68Petroleum — For other uses, see Petroleum (disambiguation). Proven world oil reserves, 2009 …
69Snow — Snowfall redirects here. For other uses, see Snow (disambiguation) or Snowfall (disambiguation). Snow is a type of precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. The process of… …
70Clay — For other uses, see Clay (disambiguation). The Gay Head cliffs in Martha s Vineyard consist almost entirely of clay. Clay is a general term including many combinations of one or more clay minerals with traces of metal oxides and organic… …
