Evolution of the Atmosphere

The most abundant gas in Earth's atmosphere today is what?

• Oxygen

• Nitrogen

• Troposphere

• Helium

What gas makes up 21% of Earth's Atmosphere today?

• Nitrogen

• Oxygen

• Ozone

• None of the Above

The _____ protects us from Earth's harmful UV rays.

• Ozone

• Troposphere

• Clouds

• Exosphere

Water vapor is one of the two main gases found in

Earth's atmosphere today

• True

• False

This gas was in high concentrations in the early atmosphere, and later condensed to form the Earth's oceans.

• oxygen

• carbon dioxide

• sulfur oxides

• water vapor

This gas was in high concentrations in the developing atmospheres and later dissolved into rainwater, added to the oceans, then settled to the bottom of the ocean. 

• oxygen
• carbon dioxide
• argon
• water vapor

According to the model, how did CO₂ get into the atmosphere?

• evaporation
• condensation
• volcanoes
• sediments

If we wanted to model the introduction of oxygen to this model, where would it take place?

• from the atmosphere to the ocean
• from the ocean to the atmosphere
• from the sediment to the atmosphere
• from the ocean to the sediment

What was the main ingredients that caused heat energy to be trapped, creating a greenhouse effect, in the ealry atmosphere?

• water and carbon dioxide

• oxygen

• carbon dioxide and oxygen

• nitrogen and carbon dioxide

What is the percentage of nitrogen in Earth's atmosphere today?

• 1%

• 21%

• 78%

• 90%