IGCSE Gases in the atmosphere

Which of the following gases was probably a major part of the early atmosphere?

• Carbon Dioxide

• Nitrogen

• Oxygen

In the modern day atmosphere, what is the approximate percentage of nitrogen?

• 0.04%

• 21%

• 78%

The early atmosphere contained a lot more water vapour than the modern atmosphere. Where did it go?

• Escaped into space

• It condensed to form the oceans

• It was absorbed by plants

What biochemical process absorbs carbon dioxide from the atmosphere and replaces it with oxygen?

• Respiration

• Digestion

• Photosynthesis

What is the laboratory test for Oxygen?

• Puts out a glowing splint

• Makes a squeaky pop sound with a burning splint

• Relights a glowing splint

What is the name of the atmospheric process which keeps the Earth warm by absorbing radiation from the Sun?

• Global Warming

• Greenhouse Effect

• Ozone Depletion

Which of the following is a greenhouse gas?

• Oxygen

• Nitrogen

• Carbon Dioxide

Which of the following is a cause of global warming?

• Burning fossil fuels to generate electricity

• Using wind farms to generate electricity

• Using solar cells to generate electricity

Which of the following is an effect of global warming?

• Flooding of low lying coastal land

• Longer days in the summer

• More crops to feed a growing world population

Which of the following could help reduce one of the possible effects of global warming?

• Moving to colder parts of the world

• Planting drought-resistant crops

• Fracking to extract more fossil fuels from the crust