Earth's Atmosphere Quiz

The air you breathe is mostly made of what gas?

• Nitrogen (N₂)

• Oxygen (O₂)

• Carbon Dioxide (CO₂)

• Methane (CH₄)

What is the approximate level of Carbon Dioxide in our atmosphere?

• less than 1%

• about 10%

• about 25%

• about 40%

The layer of the atmosphere where all weather happens is the _____

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

The layer of the atmosphere where meteors burn up is the _____

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

The layer of the atmosphere where planes fly (at their highest point) is the _____

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

The layer of the atmosphere that contains the least amount of gases is the _____

• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere

What does the ozone layer do in our atmosphere?

• It protects the Earth from harmful ultraviolet radiation

• It keeps all of the gases in our atmosphere

• It cools down the Earth by reversing the greenhouse effect

• It breaks up space rocks and creates meteors

What do greenhouse gases do in our atmosphere?

• They absorb radiation given off by the Earth
• They block radiation from reaching the Earth's surface
• They block gases from leaving the atmosphere
• They make the Earth cool

Over the past 75 years, how have Carbon Dioxide levels changed on our planet?

• They have been increasing
• They have been decreasing
• They have stayed the same

How do scientists gather information about levels of Carbon Dioxide from hundreds of thousands of years ago?

• They use ice cores drilled from arctic regions
• They use fossils of dinosaurs that lived thousands of years ago
• They have taken measurements from the air for that long
• They just guess...