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Global History & Geography for 14-15 Yr olds USA) (Thomas Caswell)
Global History & Geography for 14-15 Yr olds USA) (Thomas Caswell)
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fertilizers
A substance spread onto soil to increase its ability to support crops. Fertilizers include organic materials, such as manure, but can also be man made chemicals such as nitrates.
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Global History & Geography for 14-15 Yr olds USA) (Thomas Caswell)