composition of atmosphere - Geography Ebooks | TheGeoecologist

Question 1

What are the five layers of the atmosphere in order from Earth's surface?

Accepted Answer

The five layers are: Troposphere (0–18 km), Stratosphere (18–50 km), Mesosphere (50–80 km), Thermosphere (80–700 km), and Exosphere (700+ km). They are defined by temperature gradients.

Question 2

Why is the ozone layer important and where is it located?

Accepted Answer

The ozone layer, located in the stratosphere (15–35 km altitude), absorbs 97–99% of the Sun's harmful UV-B and UV-C radiation, protecting DNA and preventing skin cancer, cataracts, and ecosystem damage.

Question 3

How does human activity affect the atmosphere structure composition?

Accepted Answer

Human activities increase greenhouse gases (CO₂, CH₄, N₂O) enhancing global warming, and released CFCs that depleted stratospheric ozone. Aerosols from pollution alter cloud formation and air quality.

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Atmosphere Structure Composition: NCERT Class 11 Geography Guide