Unit 1 Assessment - Earth's Atmosphere

Which of the following gases is the most abundant in Earth's Troposphere?

• Nitrogen (N2)
• Oxygen (O2)
• Argon (Ar)
• Carbon Dioxide (CO2)

As you increase altitude within the troposphere, temperature

• increases, this is due to that the Earth radiates the heat back to space
• decreases, this is due to that the Earth radiates the heat back towards space
• stays the same
• does not change

The stratosphere is important due to that

• it has an ozone layer, within which it protects life from infrared radiation which would otherwise cause us to burn.
• it has an ozone layer, within which it protects life from ultra-violet radiation which would otherwise cause us to burn.
• it burns up meteors.
• contains the aurora borealis.

As the altitude increases in the stratosphere, temperature tends to

• decrease
• increase
• stay the same
• none of these

What is the relationship between altitude and air density within Earth's atmosphere?

• As altitude increases, air density decreases.
• As altitude increases, air density increases.
• As altitude increases, air density remains the same.
• There is no relationship between altitude and air density within Earth's atmosphere.

Why does air density decrease with increasing altitude within Earth's atmosphere?

• Air density decreases with increasing altitude because more atoms escape into outer space.
• Air density decreases with increasing altitude because temperature decreases with increasing altitude.
• Air density decreases with increasing altitude because the gravitational pull exerted by the Earth decreases with increasing altitude.
• Air density decreases with increasing altitude because energy from the sun pushes the air particles closer to Earth.

Within which atmospheric layer is the highest concentration of ozone found?

• troposphere
• stratosphere
• mesosphere
• thermosphere

List the layers of Earth's atmosphere in order of increasing altitude.

• exosphere, thermosphere, mesosphere, stratosphere, troposphere
• troposphere, stratosphere, mesosphere, thermosphere, exosphere
• troposphere, stratosphere, ozone layer, mesosphere, thermosphere, exosphere
• stratosphere, mesosphere, thermosphere, exosphere, troposphere

What happens to the air pressure (density) of air as you increase in altitude?

• density increases, this is due to the surface area of the atmosphere increasing as you increase altitude which allows for gas molecules to expand.
• density decreases, this is due to the surface area of the atmosphere increasing as you increase altitude which allows for gas molecules to expand.
• density stays the same
• density disappears

Which of the following is one of the reasons why air density & air pressure decrease with increasing altitude?

• Air density & Air pressure decrease with increasing altitude due to that gravity forces the gases of the troposphere towards the center of the Earth. Thus, gas molecules will be greatest at seal level.
• Air density & Air pressure decrease with increasing altitude due to that the surface area of the Earth's atmosphere decreases with increasing altitude, thus gas molecules can spread out. 
• Air density & Air pressure increase with increasing altitude. So the following question is worded wrong.
• none of the answers are correct