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Earth System Science Analysis 
Event Sphere
interactions
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Hydrosphere Event
A lack of moisture in the soil
and in vegetation may have provided a dry environment in which the
fires, once burning, could continue to burn.
Heat from the fire may have
further removed moisture from the air, soil, and vegetation through the
process of evaporation.
Atmosphere Event
A lightning strike from the air
may have started the fires by igniting the dry vegetation.
Biosphere Event
Dead branches & pine
needles on the ground may have provided fuel for the fires.
Event
Atmosphere
Gaseous pollutants such as
carbon dioxide (CO2) may have been produced during the
burning of the vegetation and carried into the air by the wind.
Event
Lithosphere
The intense heat from the fires
may have caused some rocks to break apart.
Event
Biosphere
The seeds of some plants may
have required that their outer shells be burned before they could
germinate; therefore they benefited from the forest fires.
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Sphere Sphere
interactions
Lithosphere Hydrosphere
Increased erosion of loose soil
(see "Lithosphere Biosphere," below) may have led to
increased
sediments (i.e. soil particles) in streamwater, making the water
"muddier."
Lithosphere
Biosphere
A decrease in vegetation may have
resulted in increased soil erosion because there were fewer roots to
hold the soil in place.
Lithosphere
Atmosphere
Ash particles in the air may have
been carried by the wind and dropped on the ground miles away from the
forest fires; the ash particles--which have a high pH--may have changed
the pH of the soil. .
Hydrosphere
Biosphere
Ash particles in the water may
have clogged the gills of fish and other aquatic organisms and choked
them.
Hydrosphere
Atmosphere
There may have been more
precipitation in neighboring areas because ash particles in the air may
have become condensation centers upon which raindrops could form.
Very dry, windy air may have drawn
moisture out of the living grasses and trees through the process of
evaporation.
Biosphere
Atmosphere
Smoke in the air may have coated
the lungs of animals--including people--and affected their ability to
breathe.
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Keep in mind that as
you list interactions, it is important that you be able to explain why
or how the interactions occur. For example, the
above lithosphere biosphere interaction does not
merely state "a
decrease in vegetation may have resulted in increased erodibility of
soil." It gives the reason: "because there were fewer roots to
hold it in place." Such explanations display understanding of the
science behind the interactions. These explanations are valuable for
you and others because they make "Why?" or "How?" thinking visible and
they often lead to the discovery of additional ESS interactions.
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