Earth Science



How Turquoise is Formed

Turquoise is quite possibly one of the oldest known gemstones. Pharaohs, early Native Americans, and the Aztecs Kings have all used and prized turquoise. The word turquoise has even become synonymous with that particular color of blue or colors of…
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How Limestone Forms

Limestone is a common type of sedimentary rock that is made from calcite and is used for a variety of different applications. It can be used in building applications, flooring, cement production, concrete filler, steel production, counter tops, blackboard chalk,…
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Dangers of Acid Rain

Acid rain is a general expression that refers to the concoction of wet and dry deposited substances from the atmosphere that have a greater than usual quantity of nitric and sulfuric acid. This is caused by both natural and man…
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