Worksheet 12

 WEB DIAGRAM

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Work sheet 2

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                       C OAL   AND   P ETROLEUM Fill in the blanks ·       Natural gas is stored under high pressure as                        ·       Earlier, it was used in railway                           . ·                          Is also used as a fuel in various industries. ·       The slow process of conversion of dead vegetation into coal is called               ...
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Worksheet 9

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