Earth's Atmosphere

What is the most common gas in the atmosphere?

• nitrogen
• oxygen
• water vapor
• carbon dioxide

Oxygen makes up approximately ____% of the gases in the atmosphere.

• 20
• 40
• 60
• 80

Which gas in our atmosphere is most abundant?

• Argon
• Oxygen
• Nitrogen
• Carbon Dioxide

Based on current scientific evidence, how old is the Earth?

• 6,000 years old
• 460 million years old
• 4.6 billion years old
• 46 billion years old

Earth's layers are made up mostly of __________?

• Rocks and metals

• Plastic and rocks

• Molten water

• Gases

What percent of Earth's surface is water?

• 85%

• 35%

• 50%

• 75%

The inner core is the thickest layer of Earth?

• True

• False

Earth is made up of how many layers?

• 1

• 2

• 3

• 4

• 5

Earth's atmosphere is made up mostly of ______________?

• Oxygen

• Nitrogen

• Helium

• Iron

Which gas was not present in Earth first atmosphere?

• Oxygen
• Nitrogen
• Ozone
• Argon