Q.1 Fill in the Blanks
1. It is ……………….. row boat in the moving direction of wind.
2. The bicycle tube ……………….. when it is overfilled with ……………….. .
3. Air ……………….. on heating and ……………….. on cooling.
4. The ……………….. the difference in ……………….. the ……………….. the air moves.
5. A change in the direction of wind is caused due to ……………….. of earth.
6. The wind from the ocean carry ……………….. and bring rain which is a part of ……………….. .
7. Uneven heating of land generates monsoon winds from ……………….. direction in ……………….. .
8. factors like ……………….., ……………….., ……………….. and ……………….. contribute to the development of cyclones.
Q.2 State the importance of air pressure. Give reasons for air pressure
Answers
Answer:
1. It is easy to row boat in the moving direction of wind.
2. A bicycle tube that is filled with excessive air will burst because more air means more pressure on the tube. EXPLANATION: When a tube is overfilled with air, the pressure inside the tube becomes very high and unequal to the atmospheric pressure.
3. Air expands on heating and contracts on cooling.
4. You already know that when air moves, it is called wind. Air moves from the region where the air pressure is high to the region where the pressure is low. The greater the difference in pressure, the faster the air moves.
5. Our planet's rotation produces a force on all bodies moving relative to theEarth. Due to Earth's approximately spherical shape, this force is greatest at the poles and least at the Equator. The force, called the "Coriolis effect," causes the direction of winds and ocean currents to be deflected.
6. The winds from the oceans carry water and bring rain which is a part of the water cycle.
7. This uneven heating of land' and 'water in Indian ocean' during summer, generates monsoon winds from the Indian ocean. The monsoon winds coming from the south-west direction in summer carry a lot of water vapour from the Indian ocean and bring heavy rains.
8. Factors like wind speed, wind direction, temperature and humidity contribute to the development of cyclones.
Answer:
2.bust, air pressure
3.expands , contracts
5.air pressure
6.water , monsoon winds
7south- west, indian ocean
8. temp., humidity, wind speed