Question

Non-renewable resources

(a) can never be replaced once they get used up.
(b) can be replaced but the time of replacement varies from a few hundred to millions of years.
(c) can be replaced in 50-100 years.
(d) can be replaced in 100-200 years.

Answer 1

(b) can be replaced but the time of replacement varies from a few hundred to millions of years.

Non-renewable resources, once used up, take millions of years to form.