cycles in 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 part of the water cycle does this picture show?

• condensation
• precipitation
• evaporation

Snow, sleet, hail, and rain are all examples of  ________________. 

• evaporation
• condensation
• accumulation
• precipitation

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

• condensation
• evaporation
• sublimation
• transpiration

What is the energy source for the water cycle?

• the sun
• the earth
• water
• the moon

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

Organisms that need nitrogen to survive.

• only plants

• only animals

• only bacteria

• all living things

Nitrogen rich fertilizers and manure can cause water pollution.

• True
• False

How nitrogen is "fixed" into useable form for plants

• only through action of bacteria
• only through lightning
• through action of bacteria & lightning
• through photosynthesis

How plants get the nitrogen they need

• from the air
• from the soil or water in which they live
• from the Sun
• from broken down rocks