Question

Fill in the blanks.
i) Sound travels through a...
ii) The Substances which reduces friction are called....
iii) Coal tar is a mixture of about...... .substance.
iv) Under high pressure and .....
Dead plants got slowly converted to coal
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Answer 1

Explanation:

(1) Sound travels through air.

(2) The Substances which reduces friction are called lubricant.

(3)Coal tar is a mixture of about various substance .

(4) Under high pressure and high temperature,Dead plants got slowly converted to coal.