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NCERT Solutions for Class 7 Social Science Geography Chapter 4: Air

iacst-2022

All living beings for survival need air. Air is the commonly used name for the mixture of gases that create the Earth's atmosphere. The gas is the primary element, mixed with Oxygen, vapour, greenhouse and trace gases. Chapter 4 intricately explains air by explaining the composition of the atmosphere, the structure of the atmosphere, weather and climate, etc. Through this chapter, we learn that nitrogen is the most abundant gas in the air and how when we inhale, we take some amount of nitrogen into our lungs and exhale it and how it helps plants as plants need nitrogen for their survival. However, they cannot take nitrogen directly from the air and thus take help of bacteria living in the soil and roots system of some plants that take nitrogen from the air and change their form so that plants can use it.

The chapter also explains the layers in which our atmosphere is divided into starting with the Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere in which the troposphere is the layer in which the air we breathe exists and is, therefore, a most important layer of the atmosphere. Its average height is 13 km and almost all-weather phenomenon like rainfall, fog and hailstorm occur in this layer. Above the troposphere, there lies the stratosphere which extends up to a height of 50 km and is almost free from clouds and associated weather phenomenon, making ideal conditions for flying aeroplanes while the layers also protect us from the harmful effect of the sun rays.

 

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Also See
NCERT Solutions For Class 7 History Chapter 1 Tracing Changes through a Thousand Years NCERT Solutions For Class 7 History Chapter 2 New Kings and Kingdoms NCERT Solutions For Class 7 History Chapter 3 The Delhi Sultans
NCERT Solutions For Class 7 History Chapter 4 The Mughal Empire NCERT Solutions For Class 7 History Chapter 5 Rulers and Buildings Chapter 6 Towns, Traders and Craftspersons
Chapter 7 Tribes, Nomads and Settled Communities NCERT Solutions For Class 7 History Chapter 8 Devotional Paths to the Divine NCERT Solutions For Class 7 History Chapter 9 The Making of Regional Cultures
NCERT Solutions For Class 7 History Chapter 10 Eighteenth-Century Political Formations
NCERT Solutions for Class 7 Social Science Political Science
NCERT Solutions For Class 7 Political Science Chapter 1 On Equality NCERT Solutions For Class 7 Political Science Chapter 2 The Role of the Government in Health NCERT Solutions For Class 7 Political Science Chapter 3 How the State Government Works
NCERT Solutions For Class 7 Political Science Chapter 4 Growing up as Boys and Girls NCERT Solutions For Class 7 Political Science Chapter 5 Women Change the World NCERT Solutions For Class 7 Political Science Chapter 6 Understanding Media
NCERT Solutions For Class 7 Political Science Chapter 7 Markets Around Us NCERT Solutions For Class 7 Political Science Chapter 8 A Shirt in the Market NCERT Solutions For Class 7 Political Science Chapter 9 Struggles for Equality
NCERT Solutions for Class 6 Social Science Geography
NCERT Solutions For Class 7 Geography Chapter 1 Environment NCERT Solutions For Class 7 Geography Chapter 2 Inside Our Earth NCERT Solutions For Class 7 Geography Chapter 3 Our Changing Earth
NCERT Solutions For Class 7 Geography Chapter 5 Water NCERT Solutions For Class 7 Geography Chapter 6 Natural Vegetation and Wildlife NCERT Solutions For Class 7 Geography Chapter 7 Human-Environment – Settlement, Transport and Communication
NCERT Solutions For Class 7 Geography Chapter 8 Human-Environment Interactions – The Tropical and the Subtropical Region NCERT Solutions For Class 7 Geography Chapter 9 Life in the Deserts

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