Earth’s early atmosphere probably had less oxygen than now, but more carbon dioxide and water. Increases in greenhouse gases are leading to climate change.
What formed the early atmosphere?
Where did the oceans come from?
Condensation of water vapour
What process released oxygen and absorbed carbon dioxide, causing changes to the atmosphere?
Which gas is present in the modern atmosphere in the greatest amount?
Which is a correct statement about incomplete combustion of hydrocarbon fuels?
Toxic carbon monoxide is produced
It releases more energy than complete combustion
It is cleaner than complete combustion
When fuel burns inside a car engine at high temperatures, which gas becomes oxidised?
Where does sulfur dioxide come from during combustion reactions of hydrocarbon fuels?
Sulfur is present in the air
Sulfur impurities are present in fossil fuels
Sulfur is used as a lubricant in car engines
Which of the following is not a greenhouse gas?
Which of the following produces large amounts of atmospheric methane?
The burning of fossil fuels
Rice paddy fields
Why is chlorine added to drinking water during the purification process?
To make it taste nicer
To kill harmful bacteria
To make it look clearer