COMPOSITION OF THE ATMOSPHERE

When water vapor turns into a cloud, it is doing this process

• Evaporation
• Condensation
• Precipitation
• Sublimation

What makes up 99% of the atmosphere?

• nitrogen
• oxygen
• carbon dioxide
• nitrogen and oxygen together

What does carbon dioxide in the atmosphere do?

• it absorbs heat energy 
• it provides a place for water vapor to condense
• it absorbs harmful uv radiation 
• It protects from the solar wind

What does ozone in the atmosphere do?

• it absorbs and traps heat energy
• it provides a place for water vapor to condense
• it protects against harmful uv radiation
• it helps plants grow

ozone is

• droplets of water
• a greenhouse gas
• tiny particles of liquids or solids
• three-atom oxygen

Pressure is the effect of

• the weight of all the air above pressing down
• water vapor in the atmosphere
• greenhouse gases
• solar radiation

The layer of gases that surrounds the Earth is known as its

• lithosphere
• hydrosphere
• atmosphere
• biosphere

Which gas is most abundant in Earth's atmosphere?

• oxygen
• nitrogen
• carbon dioxide
• ozone

What is the percent of oxygen within the Earth's Troposphere?

• 78%
• 21%
• 1%
• none of these

As you increase the altitude in the atmosphere, air pressure and density

• increase, this is due to the surface area of the atmosphere increasing with increasing altitude.
• decrease, the is due to the surface area of the atmosphere increasing with increasing altitude.
• remain the same.
• there is no change within the air pressure and density as you increase the altitude within the atmosphere.