Earth System Science Analysis   
spheres icon


spheres icon      Event arrow Sphere interactions 

  Hydrosphere arrow 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  arrow Event

A lightning strike from the air may have started the fires by igniting the dry vegetation.

Biosphere  arrow Event

Dead branches & pine needles on the ground may have provided fuel for the fires.

Event arrow 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 arrow Lithosphere

The intense heat from the fires may have caused some rocks to break apart.

Event arrow 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.








spheres icon        Sphere arrow Sphere interactions 

 Lithosphere arrow Hydrosphere

Increased erosion of loose soil (see "Lithosphere  arrowBiosphere," below) may have led to increased sediments (i.e. soil particles) in streamwater, making the water "muddier."

Lithosphere arrow Biosphere

A decrease in vegetation may have resulted in increased soil erosion because there were fewer roots to hold the soil in place.

Lithosphere arrow 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 arrow Biosphere

Ash particles in the water may have clogged the gills of fish and other aquatic organisms and choked them.

Hydrosphere arrow 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 arrow Atmosphere

Smoke in the air may have coated the lungs of animals--including people--and affected their ability to breathe.

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 arrowbiosphere 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.

Modified from materials available at http://www.cotf.edu/ete/ESS/ESSmain.html
Privacy Statement and Copyright© 1997-2001 by Wheeling Jesuit University/NASA Classroom of the Future™. All rights reserved.