Cycles of Matter

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

• Water
• Atmosphere
• Sun
• Air

Organisms that do not decompose can be buried and become what?

• water
• nutrients
• air
• fossil fuels

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

• bacteria

• rain

• fungi

• car exhaust

The process in which nitrogen circulates and is recycled is called

• The nitrogen cycle

• The carbon cycle

• The water cycle

• The phosphorus cycle

Organisms that need nitrogen to survive.

• only plants

• only animals

• only bacteria

• all living things

How is nitrogen "fixed" into a usable form for plants?

• Through action of bacteria only

• Through lightning only

• Through action of bacteria and lightning

• Through photosynthesis

How do animals get the nitrogen they need?

• From the air they breathe

• From the water they drink

• From the food they eat

• From the sun

What is the role of decomposers in an Ecosystem? 

• They recycle matter and nutrients to form fossil fuels
• They are burn and release as carbon dioxide
• Decomposers are responsible to turn oxygen into carbon dioxide
• They recycle energy back to the sun

Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle

Identify the cycle pictured.

• The Water cycle
• The Carbon cycle
• The Nitrogen cycle
• The Phosphorus cycle