Which of the following statements are correct?i. Lignite and low grade bituminous coal were formed during quarternary period. ii. Dolomite is used as refractory material and flux in iron and steel industry. iii. Solar energy, wind, hydel power and biogas are renewable resources. Select the correct answer using codes given below:

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Which of the following statements are correct?<br />i. Lignite and low grade bituminous coal were formed during quarternary period. ii. Dolomite is used as refractory material and flux in iron and steel industry. iii. Solar energy, wind, hydel power and biogas are renewable resources. Select the correct answer using codes given below:






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