Atmosphere

• The early atmosphere was mainly carbon dioxide and water vapour
• Water vapour condensed to form the oceans
• Photosynthesis caused the amount of carbon dioxide to decrease and oxygen to increase
• Human activities are causing global warming
• Combustion of fuel produces many pollutants
• Humans can reduce their impact on the environment
• Understanding how to approach exam questions helps to boost exam performance
• Question types will include multiple choice, structured, mathematical and practical questions