NCERT Book Class 8 Science Chapter 3 Coal and Petroleum

COAL AND PETROLEUM

W
e use various materials for our Can air, water and soil be exhausted
basic needs. Some of them are by human activities? You have already
found in nature and some studied about water in Class VII. Is water
have been made by human efforts. a limitless resource?
In the light of the availability of
Activity 3.1 various resources in nature, natural
resources can be broadly classified
Make a list of various materials used
into two kinds:
by us in daily life and classify them
as natural and man-made. (i) Inexhaustible Natural Resources:
These resources are present in unlimited
Natural Man-made
quantity in nature and are not likely to
be exhausted by human activities.
Examples are: sunlight, air.
(ii) Exhaustible Natural Resources: The
amount of these resources in nature is
limited. They can be exhausted by
human activities. Examples of these
resources are forests, wildlife, minerals,
coal, petroleum, natural gas etc.

Activity 3.2

(It is a group activity)
Does this list include air, water, soil
and minerals? Since all these are Take some containers. Fill them
obtained from nature, they are called with popcorn/peanuts/roasted
natural resources. gram/toffees. Divide students into
groups of seven each. Further divide
each group into three subgroups
containing 1, 2 and 4 students.
Can we use all our Label them as first, second
natural resources and third generation respectively.
forever ?