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In 1838 the German
chemist Justus von Liebig offered the first really useful definition of an acid,
namely, a compound containing hydrogen that can react with a metal to produce
Soil is formed when rocks are broken up by the weather and erosion and
mixed with organic matter from plants and animals...
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The term soil generally
refers to the loose surface of the Earth, made from solid rock. To the farmer,
soil is the natural medium for growth of all land plants. The rocks that make
up soil could be acid, neutral, or alkaline, another name for a base. Limestone
and chalk are rocks that are formed from tiny shells that are rich in calcium...
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