Earth’s Atmosphere

Which of the following gases is the most abundant in Earth's Troposphere? (aka which gas is mostly found?)

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

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 - this is due to the refection of UV rays from the sun.
• increase - this is due to the absorption of UV rays from the sun.
• stay the same
• none of these

The process of convection transfers heat energy _____.

• from cold areas to warm areas
• from warm areas to cold areas
• from high altitudes to low altitudes
• from humid areas to dry areas

Winds transfer energy in the atmosphere by the process of _________.

• conduction
• convection
• radiation
• precipitation

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

The Sun’s rays take about 8 minutes to reach Earth’s atmosphere. Which process describes the thermal energy transfer between the Sun and the Earth?

• Conduction
• Convection
• Radiation

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