WIND CURRENTS
WIND CURRENTS <ul><li>Although wind currents are circular patterns of moving area, they really start at the equator with t...
<ul><li>Because of the earth bulging in the equator the regions near the equator get heated up the most by the sun </li></...
<ul><li>During the hot summer, land in India becomes warmer than the sea. The air over the land evaporates, creating a vas...
<ul><li>Wind blows because of uneven heating of the Earth by the Sun </li></ul><ul><li>Near the equator the air gets warme...
QUIZ TIME <ul><li>A  Fill in the blanks:- </li></ul><ul><li>1.  The main cause of the wind is the difference in  _________...
QUIZ TIME   <ul><li>B  Name the following:- </li></ul><ul><li>The warm air goes north , it meets cold dense air from the p...
QUIZ TIME <ul><li>C  State true or false :- </li></ul><ul><li>Wind blows because of uneven heating of the earth by the sun...
QUIZ TIME <ul><li>Q1 – Name and explain the 2 types of monsoon winds. </li></ul>
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Wind currents

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  • Wind currents between equator and poles
  • Wind currents

    1. 1. WIND CURRENTS
    2. 2. WIND CURRENTS <ul><li>Although wind currents are circular patterns of moving area, they really start at the equator with the help of the sun. </li></ul><ul><li>However, important factors such as low- and high-pressure zones as well as the tilt of the earth also affect how wind blows. </li></ul><ul><li>The movement of air in a particular direction through a mass of air which is not moving much are called wind currents. </li></ul><ul><li>Surface of the earth is different in different places -- it is covered in oceans , mountains , plateaus , etc. </li></ul><ul><li>In hot regions (places near the equator) the air gets warmer as it rises up . </li></ul><ul><li>When hot air rises up, cool air rushes to take the place of the hot air. </li></ul><ul><li>Main causes of wind is the difference in temperature between two regions due to uneven heating of the earth by the sun. </li></ul>
    3. 3. <ul><li>Because of the earth bulging in the equator the regions near the equator get heated up the most by the sun </li></ul><ul><li>Near the equator regions, the air becomes warm and rises to the atmosphere. As the air rises in the atmosphere , it cools down and it is observed that the cooled air comes down around the areas of 30° north and south. Thus at the equator winds blow from the north and south towards the equator. </li></ul><ul><li>As this air goes toward north, it meets cold dense air from the poles at latitude of about 60°. Because this air is warmer than the polar air, it rises up. This area therefore is called low pressure area and it is created in the 60° latitude. The cold air in the poles rushes to take the place. Thus at the poles we observe that these winds swerve to one side. </li></ul>Wind currents between equator and poles
    4. 4. <ul><li>During the hot summer, land in India becomes warmer than the sea. The air over the land evaporates, creating a vast low pressure region. </li></ul><ul><li>These winds consequently blow into land and come from the southwest direction and bring moisture with them from the Indian Ocean. This wind pattern is known as south-west monsoon. </li></ul><ul><li>During the winter , the sea is warmer than land , and the direction of the winds is reversed that is to the north-east. They flow from land to sea. They do not carry water , but they bring back small amounts of rain in winter </li></ul><ul><li>These winds are called monsoon winds. </li></ul>Wind currents due to the uneven heating of land and water
    5. 5. <ul><li>Wind blows because of uneven heating of the Earth by the Sun </li></ul><ul><li>Near the equator the air gets warmer and it rises up. </li></ul><ul><li>The air rises in the atmosphere and then it cools down. </li></ul><ul><li>Observed that the cool air comes down to areas around 30° north and south of the equator. This becomes area of high pressure. </li></ul><ul><li>The wind of the area of high pressure blow in both directions –-- towards the equator and towards the pole. </li></ul><ul><li>This air goes north and meets cold dense air poles at the latitude of 60°, being warmer than polar air, it rises. The cold air takes its place. </li></ul><ul><li>Wind blows because of uneven heating of the earth by the sun. </li></ul><ul><li>Uneven heating of the regions near the equator and poles set up wind patterns on the earth </li></ul>Summary
    6. 6. QUIZ TIME <ul><li>A Fill in the blanks:- </li></ul><ul><li>1. The main cause of the wind is the difference in ___________ between two regions due to the uneven heating of the Earth by the sun . </li></ul><ul><li>Ans: temperature </li></ul><ul><li>2. It is observed that the cooled air comes down in the areas around _____ north and south </li></ul><ul><li>Ans : 30° </li></ul><ul><li>3. When in winter, when the sea is warmer than the land , it is the __________ monsoon. </li></ul><ul><li>Ans: north-east </li></ul>
    7. 7. QUIZ TIME <ul><li>B Name the following:- </li></ul><ul><li>The warm air goes north , it meets cold dense air from the poles at what latitude. </li></ul><ul><li>Ans: 60°. </li></ul><ul><li>The warm air in the equator, from where does the wind go to the equator. </li></ul><ul><li>Ans: From north and south </li></ul><ul><li>3. These winds consequently blow into land and come from the southwest direction and bring moisture with them from the Indian Ocean. </li></ul><ul><li>Ans: South-west monsoon </li></ul>
    8. 8. QUIZ TIME <ul><li>C State true or false :- </li></ul><ul><li>Wind blows because of uneven heating of the earth by the sun. </li></ul><ul><li>Ans: True </li></ul><ul><li>2. During winter, southwest monsoon bring back small amounts of rain. </li></ul><ul><li>Ans: False. Northeast monsoon bring back small amounts of rain. </li></ul><ul><li>3. 30° is a low pressure. </li></ul><ul><li>Ans: False. 60° is a low pressure </li></ul>
    9. 9. QUIZ TIME <ul><li>Q1 – Name and explain the 2 types of monsoon winds. </li></ul>
    10. 10. THANK YOU

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