2.3 The Biogeochemical Cycles
Name______________________
Chapter 2.3 The Biogeochemical Cycles
Textbook Pages 45 – 49
What happens to matter as organisms use nutrients?
__________________________________! Molecules are rearranged as they are3 made and broken
down.
________________________________ = Cycles that involve living organisms (bio), geological
processes (geo) and chemical processes (chemical).
Organisms cannot exist without matter:
All living things are _________________________________________________________.
-
carbon
-
hydrogen
-
nitrogen
-
phosphorus
-
oxygen
Organisms use ______________ to assemble & break down essential nutrients for life.
Without organisms, matter can only exist in its present form:
Biological processes _____________ matter through metabolic reactions.
I. The Water Cycle:
Where is water found?

_______________________________

_______________________________

_______________________________
How does water enter the biotic world?

__________________________________

__________________________________
How does water return to the environment from the biotic world?

_________________(animals sweat)

_________________(evaporation through plant leaves)

_________________(using energy)
The 3 Main Events of the Water Cycle:
1. ____________________ = water turning to vapor
2. ___________________ = making clouds
3. ___________________ = rain
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2.3 The Biogeochemical Cycles
Name______________________
II. The Carbon Cycle:
Where is carbon?
-
___________________ is in the atmosphere
-
within ______________ matter (living things)
How does Carbon enter the biotic part of the world?
-
____________________
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____________________ (food chain)
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____________________ (organisms take in nutrient for building tissues)
How does carbon return to the environment from the biotic world?
-
____________________ (exhaling CO2)
-
____________________ (combustion)
-
____________________
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2.3 The Biogeochemical Cycles
Name______________________
III. The Nitrogen Cycle:
Where is nitrogen found?
-
In the air as ______________ ______________ (N2)
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In the ground as nitrates (__________________)
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In organisms
How does nitrogen enter the biotic world?
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___________________________ = bacteria convert N2 to a “fixed” form
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_________________ & ___________________
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___________________ (the food chain)
How does nitrogen return to the environment?
-
____________________
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____________________ (bacteria)
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____________________ (excreted waste)
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