Cycles of Nature

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

What is the energy source for the water cycle?

• the sun
• the earth
• water
• the moon

What part of the water cycle does this picture show?

• condensation
• precipitation
• evaporation

What part of the water cycle does this picture show?

• condensation
• precipitation
• evaporation

What is it called when plants give off water vapor as a waste product?

• condensation
• evaporation
• sublimation
• transpiration

The first step in the water cycle 

• evaporation
• condensation 
• precipitation
• there is no first step 

What is the process during which water cools and turns from a gas to a liquid?

• Codensation
• Runoff
• Precipitation
• Evaporation

Precipitation occurs because 

• the droplets evaporate in the air
• the droplets are too light for the air to hold
• the droplets are too heavy for the air to hold

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

Which one of these does not add CO2 to the atmosphere?

• cooking with gas
• planting trees
• burning wood
• riding in a bus