History of Earth's Atmosphere Quiz

What was the primary component of Earth's atmosphere four and a half billion years ago?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Methane

Which organisms were the first to produce oxygen through photosynthesis?

• Green plants

• Cyanobacteria

• Fungi

• Algae

What was the initial effect of oxygen on early life forms?

• It caused mutations

• It was beneficial

• It had no effect

• It was toxic

What significant atmospheric layer formed due to the presence of oxygen?

• Troposphere

• Stratosphere

• Ozone Layer

• Mesosphere

Why was the formation of the ozone layer crucial for life on land?

• It provided water

• It increased temperature

• It blocked harmful UV radiation

• It provided oxygen

Approximately how many years ago did life begin to exist on land?

• 3.2 billion years ago

• 2 billion years ago

• 400 million years ago

• 100 million years ago

What has been the primary cause of recent changes in the Earth's atmosphere?

• Volcanic eruptions

• Natural disasters

• Solar activity

• Human activities

Which gas has increased in concentration due to the burning of fossil fuels?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Methane

What environmental issue is caused by the release of acidic oxides from chimneys and vehicle exhausts?

• Air pollution

• Global warming

• Ozone depletion

• Acid rain

What is the main reason for the formation of the hole in the ozone layer?

• Methane

• Carbon Dioxide

• Nitrogen

• CFCs