Air

Question 1

COMPOSITION OF THE ATMOSPHERE

Answer 1

N,O,Co2,Ar,etc

1. Nitrogen-is the most plentiful gas in the air. Plants need nitrogen for their survival.
2. Oxygen- is the second most abundant gas in the air. Humans and animals take oxygen from the air as they inhale.
3. Carbon dioxide- is another most important gas. Green plants use carbon dioxide to make their food and release oxygen.

Question 2

STRUCTURE OF THE ATMOSPHERE

Answer 2

1. Troposphere
2. Stratosphere
3. Mesosphere
4. Thermosphere
5. Exosphere

Question 3

Troposphere

Answer 3

height = 13 km
air we inhale exists here.
Most weather phenomena like rainfall, hailstorm, etc. occur in this layer.

Question 4

Stratosphere

Answer 4

height = 50 km
Being free from associated weather phenomenon, this layer is most ideal for flying aeroplanes.
Contains ozone.

Question 5

Mesosphere?

Answer 5

height = 80 km
third layer of the atmosphere.
It lies above the stratosphere. It extends up to the

Question 6

Thermosphere ?

Answer 6

height = 80-400 km
In thermosphere temperature rises very rapidly with increasing height. Ionosphere is a part of this sphere.
This layer helps in radio communications.

Question 7

Weather ?

Answer 7

is day to day condition of the atmosphere

Question 8

climate ?

Answer 8

The average weather condition of a place for a longer period of time.

Question 9

Temperature ?

Answer 9

The degree of hotness and coldness of the air (body)

Question 10

Air Pressure ?

Answer 10

is defined as the pressure exerted by the weight of air on the earth’s surface.

Question 11

Wind ?

Answer 11

The movement of air from high pressure area to low pressure areas

Question 12

Types of Winds ?

Answer 12

Permanent winds – The trade winds, easterlies and westerlies are the permanent winds. They blow throughout the year constantly in a particular direction.  Seasonal winds – These winds change their direction in different seasons- example monsoon winds in India.  Local winds – These winds blow only during a certain period of the day or year in a small area. For example, land breeze and sea breeze. – Ex-hot and dry local wind of northern plains of India is called loo.

Question 13

Seasonal winds ?

Answer 13

– These winds change their direction in different seasons

– eg. monsoon winds in India.

Question 14

Permanent winds

Answer 14

– The trade winds, easterlies and westerlies are the permanent winds.
– They blow throughout the year constantly in a particular direction.

Question 15

Local winds

Answer 15

– These winds blow only during a certain period of the day or year in a small area.
– For example, land breeze and sea breeze.
– Ex-hot and dry local wind of northern plains of India is called loo.