EESA06H3 Lecture Notes - Pyroxene, Cryosphere, Chlorophyll

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Published on 19 Apr 2013
School
UTSC
Department
Environmental Science
Course
EESA06H3
Professor
Jan 7, 2013
EESA06 Lecture 1 Notes
Scientists tend to look at Earth as a series of systems
4 major systems
o atmosphere: envelope of gases that surround our planet
o biosphere: all living or dead organic matter; not the same as the
ecosphere
o lithosphere: the solid parts of the Earth
o hydrosphere and cryosphere: hydrosphere is all water, frozen or not
frozen, and cryosphere is all the frozen water
The upper part is what interacts with everything else
78% of atmosphere is nitrogen and 21% of atmosphere is oxygen
Biosphere is not only the living components
The biosphere contains things such as vegetation in the oceans, not just what
is on land
Green to red chlorophyll areas are active biologically and are lush
The ecosphere is where the biosphere is interacting with the atmosphere,
lithosphere and hydrosphere
Humans have only been a part of Earths history in a blink of an eye in
geologic time
Conflict between the things that make for a modern human society and the
environment; our activities have an impact on planet earth
External energy is energy outside from the Earth; energy from the sun
Water or air heated at the equator by the sun causes a flow towards the poles
Flows from water or air can cause effects in other spheres (ie. erosion of
lithosphere)
Internal energy comes from inside the earth-> when Earth was formed, a lot
of heat was built up inside the planet; there are radioactive minerals
decaying which releases heat
Volcano releases gases also, which effects both the lithosphere and
atmosphere
Involves all 4 spheres-> sand is picked up by wind and nutrients from dust
fertilize the ocean and provide food for organisms
Earths crust is very thin compared to the rest of the Earth
Continental crust is the kind that is on continents or land, and oceanic crust is
what underlies the oceans
Beneath crust is the mantle, followed by the core
Can also divide up parts of the Earth by the physical properties and
behaviours (ie. is it liquid or solid)
The core is very rich in iron and magnesium; divided in two: inner part is
solid iron core, and the outer core is liquid
Crust and lithosphere are not the same
Lithosphere includes the crust but also includes the upper part of the mantle
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Document Summary

Scientists tend to look at earth as a series of systems. The upper part is what interacts with everything else. 78% of atmosphere is nitrogen and 21% of atmosphere is oxygen. Biosphere is not only the living components. The biosphere contains things such as vegetation in the oceans, not just what is on land. Green to red chlorophyll areas are active biologically and are lush. The ecosphere is where the biosphere is interacting with the atmosphere, lithosphere and hydrosphere. Humans have only been a part of earths history in a blink of an eye in geologic time. Conflict between the things that make for a modern human society and the environment; our activities have an impact on planet earth. External energy is energy outside from the earth; energy from the sun. Water or air heated at the equator by the sun causes a flow towards the poles.

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