c17 Atmosphere Review

What are the two nearest planets to Earth?

• Mars

• Venus

• Mercury

• Jupiter

Which of these best describes the Earth's early atmosphere?

• Lots of CO₂, lots of water vapour, no oxygen

• Lots of CO₂, little water vapour, no oxygen

• No CO₂, lots of water vapour, lots of oxygen

• Lots of CO₂, no water vapour, no oxygen

Where do we think the water vapour and CO₂ in the Earth's early atmosphere came from?

• space

• volcanoes

• the sea

• they were formed at the same time as the Earth

What evidence supports the idea that the Earth's early atmosphere had lots of CO₂?

• Like the early Earth, Venus and Mars are rocky planets with volcanoes. Both have lots of CO₂ in their atmospheres

• Ancient ice cores from Antarctica have been thawed out that contain pockets of CO₂

• Ancient rocks contain minerals that could only form in the presence of high levels of CO₂

• Microorganisms present on the early Earth used to produce lots of CO₂

What happened to most of the water vapour in the Earth's early atmosphere?

• The Earth cooled, condensing the water vapour and formed the oceans

• The Earth warmed up, evaporating the water vapour

• It gradually drifted off into space

• Plants used it for photosynthesis

Which process was responsible for reducing the amount of CO₂ in the air and increasing the amount of O₂?

• respiration

• evaporation

• combustion

• photosynthesis

Which substance is produced only when there is no (or very little) oxygen in the atmosphere?

• iron pyrite

• iron oxide

• calcium carbonate

• iron carbonate

Approximately, how old is the Earth?

• 4.5 billion years

• 4.5 million years

• 4.5 thousand years

• there has always been an Earth

Which of these are responsible for reducing the levels of carbon dioxide in the atmosphere?

• photosynthesis

• dissolving in the oceans

• sea creatures using dissolved CO₂ to make shells

• the production of bones in animals

Which of the following were some of the earliest photosynthetic organisms?

• plants

• algae

• cyanobacteria

• insects