ThinkRankAir
The atmosphere is a mixture of gases arranged in layers and supports life, weather, and climate. Heating creates pressure differences and movement of air. Pollution changes air quality and can damage health, ecosystems, and the climate system.
Learning Objectives
- •Describe the composition and broad layers of the atmosphere
- •Explain pressure and wind in simple terms
- •Relate humidity and clouds to weather
- •Identify sources and controls of air pollution
Key Concepts
Atmosphere supports life
Gases in the atmosphere support respiration, photosynthesis, temperature regulation, and protection from harmful radiation.
Heating drives weather
Uneven heating of Earth creates pressure differences, winds, clouds, and rainfall.
Air quality is a public concern
Transport, industry, burning, and dust can add pollutants; cleaner energy, public transport, and regulation can reduce them.
Terminology
Historical Insight
Sea breeze
During the day, warmer land can cause air to rise and draw cooler air from over the sea.
Air-quality choices
Reducing open burning and choosing cleaner transport can lower local pollution.
Quick Check
What causes wind?
What is humidity?
Name two ways to reduce air pollution.
How to use this lesson
Read the overview first, then explain the main idea in your own words before checking the key concepts. Use the quick-check questions without looking at the answer. For examination preparation, verify dates, definitions, and syllabus requirements against your official textbook and school or examination-board guidance.