Atmosphere

Objectives

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- To understand the composition and structure of atmosphere - To differentiate weather and climate - To correlate the factors influencing weather and climate - To recognize the classification of Clouds, wind and rainfall

Recap

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- Atmosphere is a thin layer of gases that surrounds the earth. - The major gases in the atmosphere are Nitrogen (78%) and oxygen (21%) - Five Layers of the atmosphere are Troposphere, stratosphere, mesosphere, thermosphere and exosphere - Atmosphere gets heated through conduction. - Wind is the horizontal movement of air - Wind blows from high pressure belt to low pressure belt. - The 4 types of winds are permanent (planetary), periodic, local and variablewinds. - Cyclone is an area of low pressure surrounded by high pressure - Anticyclone is an area of high pressure area surrounded by low pressure. - Clouds: A visible mass of Condensed water vapour floating in the air - All precipitation occurs from clouds - According to height clouds are classified into High clouds, Middle clouds and low-clouds - The main forms of precipitation are drizzle, rain, snow, sleet, hail etc