NCERT Solution for Class 7 Geography Chapter 4 - Air
NCERT Textbook Solutions are considered extremely helpful when preparing for your CBSE Class 7 Geography exams. TopperLearning study resources infuse profound knowledge, and our Textbook Solutions compiled by our subject experts are no different. Here you will find all the answers to the NCERT textbook questions of Chapter 4 - Air.
All our solutions for Chapter 4 - Air are prepared considering the latest CBSE syllabus, and they are amended from time to time. Our free NCERT Textbook Solutions for CBSE Class 7 Geography will strengthen your fundamentals in this chapter and can help you to score more marks in the examination. Refer to our Textbook Solutions any time, while doing your homework or while preparing for the exam.
NCERT Solution for Class 7 Geography Chapter 4 - Air Page/Excercise 27
(i) Earth is enveloped by a blanket of air. This envelopment/blanket is called ‘atmosphere’.
(ii) Oxygen and nitrogen constitute the bulk of the atmosphere.
(iii) Carbon dioxide creates the greenhouse effect in the atmosphere.
(iv)Weather is the collection of short-term changes in the atmosphere of the Earth. It is, in essence, the hour-to-hour, day-to-day condition of the atmosphere.
(v) Convectional rainfall, orographic rainfall and cyclonic rainfall are the three types of rainfall.
(vi) Air pressure is the pressure exerted by the weight of the air on the surface of the Earth.
(i) – (c) Ozone
(ii) – (a) Troposphere
(iii) – (b) Stratosphere
(iv) – (b) Decreases
(v) – (b) Rain
(i) – (c) Permanent wind
(ii) – (d) Local wind
(iii) – (a) Seasonal wind
(iv) – (b) Horizontal movement of air
(i) Humidity is the amount of moisture or water vapour present in air at any particular point of time. On a humid day, the level of water vapour in the air is more and as the air gets warmer, this level too increases. As a result, wet clothes take longer time to dry on a humid day.
(ii) Insolation is in fact the incoming solar radiations that are intercepted by the Earth. There is a tilt in the axis of the Earth. As a result of this tilt, the sunlight, and by extension, the incoming radiations, cover a larger area at the Equator than at the Poles.
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