Question

1. Fill in the blanks
(a) Air, water, soil and sunlight are .........natural resources.
(b) The materials that provide useful energy on burning in oxygen are...........
(c) The most widely used.........
are coal, petroleum and natural gas,
(d).............coal has the lowest percentage of carbon, i.e. about 20%.
(e) .............balls are used to repel moths and other insects.
(f) The various fractions of petroleum oil (crude oil) are separated by............​

Answer 1

a.natural (your question is wrong)

b.heat

c.fossil fuel

d.lignite

e.mothballs