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SAI INTERNATIONAL SCHOOL


             SUBJECT – GEOGRAPHY
             STD VII
             TOPIC- LESSON- 4-AIR
             SUB TOPIC- Weather and Climate, Temperature
             NOTES-

             Weather-Weather is the mix of events that happen each day in our atmosphere. Weather is the
             state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry,
             calm or stormy, clear or cloudy.
             Climate-Climate is the long-term average of weather.
             Difference between weather and climate-Weather is the day-to-day state of the atmosphere,
             and its short-term variation in minutes to weeks. Climate is the weather of a place averaged
             over a period of time.
             Temperature-Atmospheric temperature is a measure of temperature at different levels of the
             Earth's atmosphere. It is governed by many factors, including incoming solar radiation.
             Insolation-The amount of solar radiation received by the surface of Earth is called insolation. It
             decreases from the equator towards the poles.



             Most weather happens in the part of Earth’s atmosphere that is closest to the ground—called
             the troposphere. And, there are many different factors that can change the atmosphere in a
             certain area like air pressure, temperature, humidity, wind speed and direction, and lots of other
             things. When scientists talk about climate, they're often looking at averages of precipitation,
             temperature, humidity, sunshine, wind, and other measures of weather that occur over a long
             period in a particular place.





             The main difference between these two terms is the duration, where the weather is the day-to-
             day or short term condition of the changes in the atmosphere, and climate is the averaged
             weather condition of a particular place over a long time, about 30 years.
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