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Name the substance obtained from the coal tar and used to repel moths and insects.
Naphthalene balls are obtained from the coal tar and used to repel moths and insects.
Coke is almost pure form of carbon.
Coal-tar is a mixture of various substances.
Kerosene is not a fossil fuel.
Explain why fossil fuels are exhaustible natural resources?
Describe characteristics and uses of coke.
Explain the process of formation of petroleum.
The following Table shows the total power shortage in India from 1991-1997. Show the data in the form of a graph. Plot shortage percentage for the year on the Y-axis and the year on the X-axis.
|
1 |
Year 1991 |
Shortage % 7.9 |
|
2 |
1992 |
7.8 |
|
3 |
1993 |
8.3 |
|
. 4 |
1994 |
7.4 |
|
5 |
1995 |
7.1 |
|
6 |
1996 |
9.2 |
|
7 |
1997 |
11.5 |
Name two each of the exhaustible and inexhaustible natural resources.
Write the name of two natural substances.
Why are air, water and soil called natural resources?
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