Greenhouse effect

Which TWO gases made up the early atmosphere?

• Nitrogen

• Oxygen

• Carbon dioxide

• Water

When the Earth cooled and the oceans formed, what happened to the amount of water in the atmosphere?

• Increased

• Stayed the same

• Decreased

Which of these is NOT a reason that carbon dioxide decreased as the atmosphere evolved?

• Photosynthesis

• Dissolving in oceans

• Burning fossil fuels

• Trapped in sedimentary rocks

What is the process carried out by green plants that caused oxygen levels to increase.

• Respiration

• Photosynthesis

• Dissolving

What happens to the Earth's temperature when it absorbs electromagnetic radiation from the sun?

• It increases

• It stays the same

• It decreases

What type of radiation is emitted by the Earth?

• ultraviolet

• visible light

• infra-red

What do we call the molecules that absorb some of the infra-red radiation emitted by the Earth?

• The ozone layer

• Greenhouse gases

• Smog

Which one of these molecules is NOT a greenhouse gas?

• Water

• Oxygen

• Carbon dioxide

• Methane

Which of these are NOT a likely consequence of global warming?

• Flooding

• Drought making it harder to grow crops

• Increase in levels of skin cancer

• Extreme weather

Which of these is NOT a reason why carbon dioxide levels have increased in recent years?

• Burning fossil fuels to generate electricity

• More agriculture to feed a growing population

• Development of nuclear power

• More vehicles used