7.
a. Air is a ubiquitous resource since it is found...........
b. Physical factors affecting the presence of a localised resource
are........, ........... and.............
c. Using resources carefully and giving them time to get renewed is
called...........
d. An actual resource today might have been a............resource
some time ago.

8. State true or false:
i. Water is not precious. We should not bother about its wasteful
use.
ii. All sources and substances have equal economic value.
iii. We should minimise the depletion of natural resources.
iv. People are human-made resources.