Year 10 Gases of the Air

What were the primary components of Earth's atmosphere millions of years ago?

• Oxygen and Nitrogen

• Carbon Dioxide and Water Vapour

• Helium and Hydrogen

• Argon and Krypton

Which explanation is most favored for the formation of Earth's atmosphere?

• Gases from comets

• Gases from volcanoes

• Gases from the sun

• Gases released by plants

What happened to the water vapour as the Earth cooled down?

• It remained as vapour

• It turned into ice

• It escaped into space

• It formed the oceans and seas

What process did green plants use to create oxygen?

• Decomposition

• Photosynthesis

• Fermentation

• Respiration

What is the current percentage of oxygen in the atmosphere?

• 78%

• 50%

• 0.04%

• 21%

What gas becomes the most abundant in the atmosphere due to the decomposition of ammonia?

• Methane

• Oxygen

• Carbon Dioxide

• Nitrogen

What is the role of the ozone layer in the atmosphere?

• Producing rain

• Causing global warming

• Filtering out ultraviolet rays

• Producing oxygen

Where did the first forms of animal life inhabit?

• Seas

• Forests

• Deserts

• Mountains

What process do animals carry out that affects the atmosphere?

• Photosynthesis

• Respiration

• Evaporation

• Condensation

What happened to much of the carbon dioxide in the atmosphere?

• It was used by animals

• It dissolved in seawater

• It escaped into space

• It formed the ozone layer