Earth's Atmosphere

Objective #1

What are the two main gases in the atmosphere?

• Oxygen & Helium

• Oxygen & Methane

• Nitrogen Oxygen

• Nitrogen & Argon

What layer of the atmosphere do we live in?

• Troposphere

• Stratosphere

• Ionosphere

• Mesosphere

Objective #4

What layer of the atmosphere do airplanes fly in?

• Ionosphere

• Stratosphere

• Troposphere

• Mesosphere

What happens as the temperature of air increases?

• The kinetic energy of the molecules increases.

• The kinetic energy of the molecules decreases.

• The potential energy of the molecules increases.

• The potential energy of the molecules decreases.

Nitrogen makes up what percent of our atmosphere?

• 21%
• 1%
• 87%
• 78%

Which of the following lists the layers of the atmosphere in order from Earth's surface to space?

• Thermosphere, Stratosphere, Mesosphere, Thermosphere, Exosphere
• Troposphere, Stratosphere, Mesosphere, Thermosphere, Exosphere
• Thermosphere, Stratosphere, Mesosphere, Exosphere, Thermosphere
• Troposphere, Mesosphere, Stratosphere, Thermosphere, Exosphere

The layer of the atmosphere with the greatest air pressure is the ____________.

• Troposphere
• Stratosphere
• Mesosphere
• Exosphere

As altitude increases in the troposphere, temperature __________.

• increases
• decreases
• stays the same
• none of the above

Which of the following explains one reason why Earth's atmosphere is important?

• It is beautiful.
• It prevents pollution from happening.
• Life on Mars could not exist without it.
• Life on Earth could not exist without it. 

What keeps Earth at an average temperature of only 14 degrees Celsius (57.2 degrees Fahrenheit)?

• The atmosphere, which creates the greenhouse effect

• Clouds, which reflect AND absorb some of the sun's heat

• The sun

• The moon