Environmental Final Review

What is the most abundant gas in the Earth's atmosphere?

• Oxygen

• Argon

• Nitrogen

• Carbon Dioxide

What percentage of the Earth's atmosphere is made up of oxygen?

• 78.0%

• 20.9%

• 0.9%

• 0.02%

Which gas makes up 0.9% of the Earth's atmosphere?

• Nitrogen

• Oxygen

• Argon

• Carbon Dioxide

Which of the following is NOT a trace gas in the Earth's atmosphere?

• Carbon Dioxide

• Neon

• Helium

• Oxygen

What is the percentage of trace gases in the Earth's atmosphere?

• 78.0%

• 20.9%

• 0.9%

• 0.2%

What needs to convert the nitrogen we breathe before it can be used by our bodies?

• Nitrogen-fixing bacteria in the soil

• Oxygen-fixing bacteria in the air

• Carbon-fixing bacteria in the water

• Hydrogen-fixing bacteria in the soil

What was the primary cause of the intense volcanic activity during the first billion years of Earth's history?

• The presence of a large number of meteorites

• The cooling of the planet

• The movement of tectonic plates

• The formation of the oceans

What gas was primarily produced by volcanic activity in the first billion years?

• Oxygen (O2)

• Nitrogen (N2)

• Carbon Dioxide (CO2)

• Methane (CH4)

What happened to water vapor as the planet cooled?

• It turned into ice

• It condensed and formed the oceans

• It escaped into space

• It remained in the atmosphere

What allowed CO2 to dissolve during the first billion years?

• The formation of ice caps

• The presence of plants

• The condensation of water vapor forming oceans

• The increase in atmospheric pressure