Question 13 Marks
Due to which reasons does the phenomena of change in season occur?###Explain, by drawing a figure, how do the seasons change on earth?
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Question 23 Marks
What changes occur in weather with de increase in altitude from sea level?
Answer
View full question & answer→Height from sea level: The temperature and the pressure of the atmosphere decrease as we go higher from sea level. Generally the temperature decreases by $1^{\circ} C$ for every 165 metres or by $6.5^{\circ} C$ for every 1000 metres.
→ Every layer of the air exerts pressure over the underlying layer. As we go higher the air layers are less in number and thin, so the air pressure decreases. That is why the air remains cool in higher mountainous regions. e.g., There is much heat in the plains of north Gujarat while the hill station at Mt. Abu, which is nearby, enjoys pleasant weather during summer.
→ Altitude increases the rainfall. Very high peaks of Himalaya remain snow-clad throughout the year. As the damp air rises high and cools down, it gives rain. e.g.,In the mountainous regions of Assam and Meghalaya, there is more rain with the increase in height.
→ Every layer of the air exerts pressure over the underlying layer. As we go higher the air layers are less in number and thin, so the air pressure decreases. That is why the air remains cool in higher mountainous regions. e.g., There is much heat in the plains of north Gujarat while the hill station at Mt. Abu, which is nearby, enjoys pleasant weather during summer.
→ Altitude increases the rainfall. Very high peaks of Himalaya remain snow-clad throughout the year. As the damp air rises high and cools down, it gives rain. e.g.,In the mountainous regions of Assam and Meghalaya, there is more rain with the increase in height.
Question 33 Marks
Give explanation about the 'Trade Winds'.
Answer
View full question & answer→The permanent winds blowing from Tropical high pressure belts in both hemispheres towards the Equatorial low pressure belt are called Trade Winds'.
→ These winds deflect slightly due to the coriolis force and blow towards equator. These winds blow regularly at almost uniform velocity. They used to be beneficial earlier to the ships run on wind energy on sea routes for trade. Since then these winds are known as "Trade Winds.
→ As these winds blow from land these are dry. But when they pass over the vast water mass of the Indian Ocean in the south, the Arabian Sea in the west and the Bay of Bengal in the east, they bring much moisture and give rain in India.
→ These winds deflect slightly due to the coriolis force and blow towards equator. These winds blow regularly at almost uniform velocity. They used to be beneficial earlier to the ships run on wind energy on sea routes for trade. Since then these winds are known as "Trade Winds.
→ As these winds blow from land these are dry. But when they pass over the vast water mass of the Indian Ocean in the south, the Arabian Sea in the west and the Bay of Bengal in the east, they bring much moisture and give rain in India.
Question 43 Marks
Explain the cycle of seasons of India.
