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Lecture

Lecture 3

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Department
International Development Studies
Course Code
IDSB02H3
Professor
Issac

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Environmental Science 9/27/2010
What is a system
oA system can be anything, very much relies on the question you are trying to
answer
oEx. If youre concerned about what happening to the tree in your backyard
that tree might be the system
Input could be the sun energy into the tree
Output could be the oxygen from the trees
oThe earth in its entirety is a closed systems and the boundary is our
atmosphere
oAn open system could be other things such as cars (fuel in, exhaust out) etc
oThe output from any system can have an impact the input of that system, this
is called a feedback loop if this is continuous
Negative feedback loop: when its hot you sweat, otherwise you would
burn up moving the system in an opposite direction, it regulates you.
In general keeps things in equilibrium this is a steady-state
Positive feedback loop: is when it keeps going one way continuously so
that things become more positive or more negative and keep adding up
Not regulated so generally causes damage
Rock Cycle
oAtmosphere is one system, includes everything from above the surface to
space
oAnything below your feet is lithosphere
oBiosphere is everything living on earth
oHydrosphere is all the water that moves around the atmosphere and
regulates our climate
oThe cyrosphere is approx. a cross between the hydrosphere and lithosphere,
anything frozen
oAntrosphere is like the biosphere but more specifically on humans
www.notesolution.com
Environmental Science 9/27/2010
Lithosphere
oMakes soil, rocks degrade and break apart and weather, provide chemicals
oBasis for all life
oIt is necessary for all things to happen for example for plants to go
w/o plants we all die
oRocks dont always stay the same
oThey change by
Weathering: pieces fall off, dissolve off the rock
Heat and pressure causes them to melt
oIgneous rock is magma that cools on the surface of the earth
oSedementary rock are rocks formed from little pieces of other rocks
oMetamorphic rocks is sort of in between, heat the rock enough to morph but
not melt
oEarths surface rock is the crust, below that is the Mantle which is malleable
(able to bend because its soft) allows convective currents
oTectonic plates move generally 2 cm/yr but these movies make up our
landscapes
3 types of boundaries
Divergent plate boundary
Transform plate boundary
oCauses earthquakes
Convergent plate boundary
oCauses mountain ranges
Japan was created by two plates crashing causing one plate to go
under the other and allow magma to reach the surface thus creating
more land by cooling the magma on the earths surface
www.notesolution.com

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Description
Environmental Science 9272010 What is a system o A system can be anything, very much relies on the question you are trying to answer o Ex. If youre concerned about what happening to the tree in your backyard that tree might be the system Input could be the sun energy into the tree Output could be the oxygen from the trees o The earth in its entirety is a closed systems and the boundary is our atmosphere o An open system could be other things such as cars (fuel in, exhaust out) etc o The output from any system can have an impact the input of that system, this is called a feedback loop if this is continuous Negative feedback loop: when its hot you sweat, otherwise you would burn up moving the system in an opposite direction, it regulates you. In general keeps things in equilibrium this is a steady-state Positive feedback loop: is when it keeps going one way continuously so that things become more positive or more negative and keep adding up Not regulated so generally causes damage Rock Cycle o Atmosphere is one system, includes everything from above the surface to space o Anything below your feet is lithosphere o Biosphere is everything living on earth o Hydrosphere is all the water that moves around the atmosphere and regulates our climate o The cyrosphere is approx. a cross between the hydrosphere and lithosphere, anything frozen o Antrosphere is like the biosphere but more specifically on humans www.notesolution.com
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