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Plants Producing:
Crushed Stone.—There are over 3,000 plants producing crushed stone commercially in the United States. The leading states are Pennsylvania, Ohio, Illinois, Michigan, New York, Florida, Missouri, Texas, Tennessee, Virginia and Kentucky. Plants range in size from less than 1,000 tons annual production to several million tons. In the mid-1960's nearly one third of the crushed stone output was from plants producing 900,000 tons or more annually. More than 92 per cent of the crushed stone came from plants with an annual production of 100,000 tons and higher.Hydrocarbons are stored solar energy. Organic matter is synthesized by living plants using the sun's energy converted by chlorophyll. Swarms of tiny plants and animals feeding on these plants lived in the seas and their dead bodies fell to the bottom. Under normal conditions, ordinary decay by bacteria breathing oxygen would "burn up" the organic matter, producing carbon dioxide and water.
Milk production for use as butter and cheese, however, did not have to be transported so quickly to the consumer. Therefore, farms producing milk for these purposes were concentrated in the more remote areas of the Northeast and North Central states, where there were good pastures and plenty of grain for feed. Butter plants and cheese factories were developed in these areas to receive the growing production of milk. More recently evaporated milk, condensing, and drying plants have developed in these areas.
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