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प्रश्न
The ultimate source of all water on the earth is
विकल्प
oceans and seas
spring and wells
rivers and lakes
rain
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उत्तर
rain
APPEARS IN
संबंधित प्रश्न
Why do organisms need water?
Explain how the peculiar variation of density of water with temperature can cause water— pipes to burst in very cold places.
Answer the following question:
Name two gases dissolved in natural water.
Fill in the blank:
The type of water softened by addition of washing soda is ______.
Fill in the blank:
Unpolluted water has _____ amount of dissolved oxygen.
State whether the following statement is True or False. If false, write the correct statement.
Ice is solid whereas snow is the semi-solid form of water
State whether the following statement is True or False. If false, give the correct statement.
51% of the earth’s surface is covered with water
From where do the following usually get water? In which form is water present in them?
Plants
Which of the following is waste water?
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
| (a) | Inorganic impurities | (i) | phosphorus and nitrogen |
| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
