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- 1From:The Gale Encyclopedia of Science (Vol. 5. 6th ed.)A nonmetal is a chemical element that generally does not conduct heat or electricity very well, is usually a solid or a gas at normal temperatures, and (for solids) is difficult to reshape by pounding or beating....
- 2From:The Gale Encyclopedia of Science (Vol. 5. 6th ed.)Nonpoint sources refer to numerous, relatively small sources of gases, metals, pesticides, nutrients, or other pollutants into the environment. Collectively, these many sources can represent a substantial contribution of...
- 3From:The Gale Encyclopedia of Science (Vol. 5. 6th ed.)Mineralogy is the branch of geology concerned with the study of minerals. A mineral is a naturally occurring, homogeneous solid with a definite chemical composition and a highly ordered atomic structure. A homogeneous...
- 4From:The Gale Encyclopedia of Science (Vol. 6. 6th ed.)The arrangement of the chemical elements into periods (horizontal rows) and groups (vertical columns) is called the periodic table. The periodic table is an essential part of the language of chemistry. It has much in...
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