Nitrogen makes what percent of the Earths atmosphere?

• 68%
• 25%
• 78%
• 212%

Oxygen makes up what percent in the Earth's atmosphere?

• 21%
• 25%
• 68%
• 12%

The atmospheric layer closest to Earth's surface is called what?

• Ionosphere
• Stratosphere 
• Troposphere 
• Ozone Layer

The atmospheric layer directly above the troposphere is the what? 

• Stratosphere
• Ozone layer
• Ionosphere
• Atomsphere

The area of the stratosphere with a high concentration of ozone is referred to as the what?

• Stratosphere
• Atomsphere
• Ionosphere
• Ozone Layer

In which layer of the atmosphere do planes fly?

• Thermosphere
• Troposphere
• Exosphere
• Stratosphere

At higher altitudes the air is what ?

• Blob
• Less Dense
• More Dense
• Pressure

At lower altitudes the air is what?

• More Dense
• Less Dense
• Pressure
• Blob

The definition of reflect?  

• To return light, heat, sound, etc., after it strikes a surface
• An ordered series of actions
• the transfer of energy by electromagnetic waves
• to think quietly and calmly

Define conduction

• the transfer of thermal energy by collisions between particles of matter
• i don't know
• to think quietly
• an ordered series of action