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question_answer1) What are the main varieties of iron ore?
question_answer2) Give the uses of tin and gold.
question_answer3) Why do you think use of wood as fuel should be minimised?
question_answer4) Why are coal and petroleum called fossil fuels?
question_answer5) How is hydroelectricity produced?
question_answer6) Why is solar energy used by a few tropical countries?
question_answer7) Give two advantages and disadvantages of using each of the following types of energy: Coal, Nuclear, Hydel, Wind, Geothermal, Solar.
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