Atmosphere Flashcards

Flashcards about the composition and structure of the atmosphere for Class 7 Geography (ICSE) students.

What is the atmosphere?

A blanket of gases surrounding the Earth.

What percentage of the atmosphere is made up of Nitrogen?

78%

What percentage of the atmosphere is made up of Oxygen?

21%

What is Nitrogen's role in the atmosphere?

Growth and development in living organisms.

What are the two main uses of Oxygen?

Breathing and forming ozone to protect from UV rays.

What is Carbon Dioxide used for?

Photosynthesis and trapping heat for the greenhouse effect.

What is the role of Water Vapour?

Rainfall and weather patterns.

Where is air pressure the highest?

Highest at sea level.

How far does the Troposphere reach?

Up to about 8-18 km.

What weather phenomena occur in the Troposphere?

Clouds, rain, and storms.

What is the lapse rate in the Troposphere?

Temperature decreases with height, about 1°C per 165m.

What is the defining characteristic of the Stratosphere?

Contains the ozone layer and absorbs UV rays.

What happens to meteors in the Mesosphere?

Meteors burn up in this layer.

What are the main characteristics of the Thermosphere?

Heated by solar radiation and contains the Ionosphere.

What is the composition of the Exosphere?

Light gases and very low density.