Spinning paper spiral

What is the energy source for the water cycle?

• the sun
• the earth
• water
• the moon

Which of these is an example of precipitation?

• snow
• air
• clouds
• vapor

What is the water cycle?

• the 3 forms of water
• the movement of water on, above, or below the surface of the Earth
• when water melts
• when clouds form

Which stage does the #2 show in the diagram?

• condensation
• evaporation
• precipitation
• run off

Which stage does the #3 show in the diagram?

• condensation
• evaporation
• precipitation
• run off

what does the #4 show in the diagram?

• condensation
• evaporation
• precipitation
• run off

Which stage does ground water try to return to the ocean or soak into the ground?

• condensation
• evaporation
• precipitation
• run off

What causes differences in air pressure around the earth?

• less dense air near the poles

• unequal heating of the earth

• differences in gravity

• Oxygen levels

What causes warm air to rise?

• the fact that it's less dense than cold air 
• The fact that it weighs more than cold air 
• The fact that it has higher pressure than cold
• the fact that its more dense than cold air 

What causes wind to blow?

• Differences in longitude 
• Shock waves from clouds 
• Differences in air temperature and pressure 
• The rotation of the earth