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Match it!
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Organisms called ___________________ release carbon dioxide when they break down dead organisms.
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
Water condenses in the atmosphere and falls, as _____________ into oceans and the ground, or over land as ____________.
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
Plants use nitrogen in the form of __________________.
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
I am the continuous changing of nitrogen gas into compounds in the soil and its later release back to the air. What am I?
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
Nitrogen ____________________ places nitrogen in a form in which it can be used by most living organisms.
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
I fall on Earth’s surface as rain, snow, sleet, or hail. What am I?
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
I am a mixture of decayed plant and animal material that can be used as fertilizer. What am I?
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
I am the continuous exchange of carbon among living things. What am I?
carbon cycle
precipitation
nitrates
precipitation
fixation
nitrogen cycle
decomposers
compost
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