What goes around comes back around!
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Transcript of What goes around comes back around!
What goes around
comes back around!
Water Cycle, Carbon Cycle, Oxygen
Cycle & Nitrogen Cycle
Water Cycle
The water cycle involves the processes of evaporation, condensation, precipitation, transpiration, percolation and runoff.
BrainPOP: Water Cycle
Percolation
Carbon Cycle
The process by which carbon moves between organisms and their physical environment.
BrainPOP: Carbon Cycle
Producers take in CO2 during photosynthesis.
Consumers take in carbon when they eat plants or other animals.
Plants and animals release CO2 to the atmosphere during cellular respiration.
When plants and animals die, decomposers break down their remains, releasing CO2 into the atmosphere and soil.
CO2
CO2
CO2
CO2
After millions of years of being buried in the Earth, dead plant and
animal matter becomes fossil fuels (oil/coal).
When fossil fuels are
burned, CO2 is released into
the atmosphere.
CO2 CO2
What are decomposers?Organisms that break down dead plant and animal matter.
Ex: bacteria, fungi, earthworms
Adventures of Carbon Dude
Volcanic eruptions and forest fires
Other natural ways carbon is released into the atmosphere…
Carbon sinks (absorbers)
Carbon sources (releasers)
Plants
Ocean
Atmosphere
Soil
Animals
Decomposers
Volcanic activity
Deforestation
Burning fossil fuels
How humans affect the
carbon cycle… Burning fossil fuels is
releasing more carbon into the atmosphere.
Deforestation removes trees that absorb carbon
and the fire releases carbon dioxide.
So, more carbon is being released now than
is being absorbed!!
1. During the carbon cycle, by which process do producers (plants) obtain carbon from their environment?
2. How do consumers (animals) get the carbon they need?
3. When organisms die, what other type of organism breaks down their remains to return carbon into the soil and air?
Exit Slip (carbon cycle)
Oxygen Cycle
The process by which oxygen is recycled through ecosystems.
Plants produce and
release oxygen during photosynthesi
s
O2O2
Animals take in O2 from air
or water
O2O2
O2
O2
O2O2
The ocean also plays a BIG role in the carbon and oxygen cycles!
There is 50 times MORE carbon in the ocean than in the atmosphere!
Marine plants (such as algae) are responsible
for producing HALF the oxygen that we breathe!
4. Explain how the cycles work together to keep a balance of oxygen and carbon on Earth.
Questions
Nitrogen Cycle
The process by which nitrogen is recycled in an ecosystem.
BrainPOP: Nitrogen Cycle
“Free” nitrogen falls to the Earth
in precipitation
Free nitrogen is converted into a usable form by
bacteria on plant roots in a process called nitrogen
fixation.
The usable nitrogen can now be absorbed by
the plants
Animals get nitrogen from eating the plants or by eating other animals that
ate the plants
Decomposers return nitrogen to the
atmosphere and soil through waste and decay.
What is the source of energy for all cycles in
nature?
THE SUN!
5. Describe what must happen to nitrogen gas
(“free” nitrogen) before organisms are able to use it.