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Cycles in Nature
Chapter 2
Review
Key Vocabulary…
Section 1
Evaporation
Condensation
Combustion
Decomposition
Precipitation
Transpiration
Respiration
Section 2
Pioneer Species
Succession
- Primary Succession
- Secondary Succession
The Water Cycle
The Carbon Cycle
What’s the big deal? Is it that important?
YES!! When people burn fossil fuels, the carbon
that was originally taken up from the atmosphere
by the plants is released as carbon dioxide. New
carbon atoms aren't produced and introduced into
the atmosphere. The carbon atoms that exist in
the world today have been in existence since the
beginning of time. These atoms, which are
necessary to sustain life, are still here because
they have been recycled countless times via the
carbon cycle. If the carbon cycle can no longer
function properly, life as we know it will be
changed drastically.
The Carbon Cycle
Release of Carbon Dioxide…when a green
plant dies, the carbohydrates are usually
broken down by fungi or bacteria, which are
decomposers. The Fungi and bacteria
undergo respiration, which allows them to
release the carbon back into the atmosphere
as carbon dioxide.
The Carbon Cycle
The Nitrogen Cycle
Lightning plays part in
the fixation of
atmospheric nitrogen.
The extreme heat of a
lightning flash causes
nitrogen to combine
with oxygen of the air
to form nitrogen
oxides. The oxides
combine with moisture
in the air. The fixed
nitrogen is carried by
rain to the earth,
where, in the form of
nitrates, it is used by
plants.
Succession (Primary)
Succession (Secondary)
Pioneer Species
Pioneer Species: The first organisms to
inhabit an area after a disturbance; they help
break down rocks and form soil; examples
are lichens and mosses.
Let’s Review…Suc-ces-sion
Yeah!
http://youtu.be/rzE6BNNLew0