Deep in the Earth's crust, silver is one of the important metals that can be found, along with gold, copper, lead and zinc. It is formed by forming compounds with sulfur. Due to hot temperature, salty water called brine dissolves, collects and concentrates silver into the brine. Once the brine mixes with cold sea water, the metal does not stay dissolved and precipitates on the sea floor as minerals.
Silver is classified as a transition and precious metal. It is a transition metal because it is situated between groups two and 13 in the periodic table of elements. It is a precious metal because it is not very abundant in the Earth's crust and not very chemically active but very attractive. It is also a resistant mineral since it does not dissolve in solvents and does not react to oxygen or water. It often occurs as a free element in nature and can be extracted easily from ores. This is why it has been used by humans for thousands of years, specifically for photography, jewelry, electrical equipment, mirrors, and medical and dental equipment. It is also often used to make alloys, the melting and mixing of two or more metals, with gold and is also often mixed with arsenic and antimony.Learn More
The U.S. Energy Information Administration estimates that the natural gas reserves of the United States will last around 92 years. The estimate will hold true only if the national natural gas consumption rate stays at the 2011 levels, around 24 trillion cubic feet per year.Full Answer >
Washington state has many natural resources, both renewable and nonrenewable, and has established a state-level Department of Natural Resources to regulate their use. Washington is known to have large supplies of timber and open farmland. It has rich fisheries and a thriving tourist industry that bring people in to enjoy them. Washington also has mineral resources that it exports around the world.Full Answer >
Proximate analysis reveals the quality and precise chemical composition of a coal sample. This analysis examines four factors: moisture, volatile compounds, ash content and fixed carbon. Information revealed during proximate analysis impacts coal prices and determines the most efficient use for each shipment.Full Answer >
Maize, otherwise known as corn, is important to the economy due to its wide range of uses. Maize is primarily used as feed for livestock, suggesting the dependence of the livestock industry on corn production. It is also used to create a variety of food and nonfood products, such as corn meal, sweeteners, corn oil, starch and ethanol, which is used as a cleaner-burning alternative to gasoline.Full Answer >