Class Notes (866,423)
CA (523,205)
U of G (27,469)
GEOG (629)
GEOG 1220 (115)

Week #4 Lecture g.docx

4 Pages

Course Code
GEOG 1220
Scott Brandon

This preview shows page 1. Sign up to view the full 4 pages of the document.
Week #4 Biological Processes and Models Availability of energy and matter are highly variable from place to place and account for the diversity of life on Earth Limiting factors = physical, chemical and biological characteristics that restrain population growth … •For example, plant productivity (e.g. photosynthesis) is limited by the requirement in least supply •Environmental resistance = All limiting factors taken together The Flow of Matter in the Biosphere Nutrients = elements and compounds required for survival that are consumed by organisms 1) Sedimentary Cycles: nutrients spend much of their time locked up in rock but are released for use by life as a result of weathering processes. Examples: calcium, phosphorous 2) Gaseous Cycle: Nutrients spend much of their time in the atmosphere. Nutrients are exchanged between the biosphere and the atmosphere. Examples: The phosphorus cycle: The nitrogen cycle: -inorganic nitrogen becomes organic through this cycle. It can then be used by living things and then a demystification cycle occurs. Heat makes nitrogen organic (being struck my lightning) -organic forms is called nitrates -we’ve added a lot of nitrogen to the earth from fertilizers The carbon cycle: -oxygen cycle and carbon cycle are closely related (they are just the opposite of each other) -carbon cycle is photosynthesis and respiration -we’re pulling coal out of the earth where it would otherwise be stable -burning coal increases carbon dioxide -human progression is linked to carbon *we became agriculturalists, we learned to burn, compost, save, fire, and transformed the earth -now we can manipulate carbon at the microscopic scale ex: Nano science -complex systems are more stable The Carbon Cycle and Human History 1.Burning simple carbons 2.Controlling carbon life-forms 3.Burning complex carbons (hydrocarbons) 4.Controlling carbon micro-lifeforms The Flow of Energy in the Biosphere Food Chain: a sequence of organisms in an ecosystem, each eating or decomposing its prey Food Web: a set of interconnected food chains by which energy and matter circulate through an ecosystem Natural Variations in Energy and Matter Biome = major regional complex of similar communities
More Less
Unlock Document
Subscribers Only

Only page 1 are available for preview. Some parts have been intentionally blurred.

Unlock Document
Subscribers Only
You're Reading a Preview

Unlock to view full version

Unlock Document
Subscribers Only

Log In


Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.