1. Just five nonmetals account for most of the earth’s atmosphere, crust, and the oceans. They are carbon, nitrogen, oxygen, silicon, and _____. Fill in the blank. Hint: This element is the most ...
While Southern Arizona is known for its porphyry copper deposits, Northern Arizona is better known for its nonmetallic commodities, including basalt, helium, potash and carbon dioxide (CO2). More than ...
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