Paper can be made from many plants, but usually trees are used. First, the wood is mashed into a pulp. Then, the pulp is whitened with chemicals and mixed with water. Next, the mixture is sprayed onto a screen to make a mat. After the mat of paper is dried and pressed, the paper is ready. In the factory, paper rolls can be forty miles long. They are cut before being packaged and sent to stores.

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Making paper requires a long _______