Cycles - 19 Vocabulary

Which substance has to be "fixed" to make it available to living things?

• Carbon
• Nitrogen
• Water
• Hydrogen

What is Evaporation?

• The change of state from a gas to a liquid 
• The change of substance from a liquid to a gas 
• Any form of water that falls to the Earth's surface from the clouds 
• The burning of a substance 

Nitrogen fixation...  

• is done by only plant 
• is done mostly by bacteria 
• is how animals make proteins 
• is a form of decomposition 

What happens when organisms die? 

• decomposer break down the remains 
• producers break down the remains 
• composers break down the remains 
• the remains are preserved

What is a decomposition?

• The process of burning a substance  
• The breakdown of substance into simpler molecules 
• the change of a substance from solid to a liquid 
• The change of state from a gas to a liquid 

What is respiration? 

• The exchange of carbon between the environment and living things 
• Water from the environment moves through plants and animals and back to the environment
• It returns carbon when sugar molecules are broken  down to release energy in animals 
• carbon may remain in the environment for millions of years before becoming available to living things

What percentage of the world's atmosphere consists of nitrogen gas?  

• 98%
• 84%
• 38%
• 78%

What is an example of decomposition?

• organisms cannot use nitrogen gas directly
• when fungi and bacteria decompose organic matter
• element that is important to most living things
• movement of water between the oceans, atmosphere, land, and living things

Carbon in the air is attached to two oxygen atoms and is known as a molecule called BLANK?

• Carbon oxygen 
• carbon dioxide 
• carbon molecule 
• carbon organic 

What is Photosynthesis?

• water are released as byproducts
• molecules are broken down
• is the base of the carbon cycle
• bacteria in the soil