ICSE Solutions for Class 9 Geography – Composition and Structure of the Atmosphere ICSE Solutions for Class 9 Geography – Composition and Structure of the Atmosphere Exercises I. Short Answer Questions. Question 1. What is known as atmosphere ? Answer: The blanket of air upto 1500 km surrounding the earth is known as atmosphere. Question 2. State the gaseous composition of the atmosphere. Answer: The atmosphere consists of 78% Nitrogen 21% oxygen and 1% other gases. Question 3. Mention any three functions of the atmosphere. Answer: Air has weight and exerts pressure. Being pressed down it always remains in contact with land and water. Due to their physical contact, exchange of gases between air, land and water takes place on a continuous basis. Soil absorbs oxygen and nitrogen due to this contact. Water vapours in air rise from oceans on account of evaporation. Question 4. Name the four layers of the atmosphere. Answer: Four layers of the atmosp...
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