1. Which of these is associated with hurricanes?  

• A strom that forces strong winds towards the ground
• A storm that develops in warm air closer to the equator
• A storm that develops many high-pressure thunderstrom clouds
• a storm that causes an area of low pressure beneath the warm air

In the United States, lightning occurs most often in Florida. Which of these is a cause of lightning?

• a sudden spark or electrical discharge between clouds or between clouds and the ground
• rapidly expanding air caused by intense heat
• solar particles interacting with the atmosphere
• low slanting rays of the Sun refracted by ice crystals 

How do the conditions for a tornado differ from the conditions for a hurricane?

• Tornadoes never form when there is rain, while hurricanes always form with rain.
• Tornadoes form under low pressure, while hurricanes form under high pressure.  
• Tornadoes form in a stable atmosphere, while hurricanes form in an unstable atmosphere.
• Tornadoes form over land, while hurricanes form over bodies of water.  

Which of the following is the most likely cause of the high and low pressure systems?  

• lunar gravity
• global warming
• magnetic field  
• solar energy

Which type of cloud would produce hail or thunderstorms?

• cirrus  
• cumulonimbus
• cumulus
• stratus

Which type of front does the symbol represent?  

• cold front  
• warm front  
• stationary front  
• occluded front  

Which invention has done the most to help predict weather and warn people of approaching storms?

• satellites
• airplanes
• barometers
• maps

Measurements of carbon dioxide concentrations in the air taken over the past decade have shown a  

• leveling off.  
• slow increase.  
• steady decline.  
• dramatic increase.

In which layer of the atmosphere does most of Earth’s weather occur?

• the exosphere, which is the outermost layer  
• the troposphere, which is the lowest layer  
• the stratosphere, which contains a sub-layer of ozone  
• the mesosphere, where meteors burn up.  

Which gas, labeled 'Gas
makes up the greatest percentage of Earth's atmosphere?

• carbon dioxide
• oxygen
• Ozone
• nitrogen