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16 Cards in this Set

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Conservation of Matter



  the principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed  
the principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed

Positive Feedback

occurs when an increase in output leads to a further increase in output

occurs when an increase in output leads to a further increase in output

Thomas Malthus

  An 18th-century British philosopher and economist famous for his ideas about population growth. Malthus' population theories were outlined in his book, "An Essay on the Principle of Population", first published in 1798.  
An 18th-century British philosopher and economist famous for his ideas about population growth. Malthus' population theories were outlined in his book, "An Essay on the Principle of Population", first published in 1798.

Doubling Time


2No=No^ekTd

the time necessary for the quantity being measured to double

the time necessary for the quantity being measured to double

Negative Feedback

an increase in output leads to a later decrease

an increase in output leads to a later decrease

Lag Time

the delay between a cause and the appearance of its effect

the delay between a cause and the appearance of its effect

Closed System

nothing moves in or out of a system

nothing moves in or out of a system

Open System

moves into or out of the system

moves into or out of the system

Biomass

the total mass of organisms in a given area or volume.

the total mass of organisms in a given area or volume.

Exponential growth


N=Noe^kt

when something grows at a constant rate per time period

when something grows at a constant rate per time period

Nonlinear Response

includes exponential growth, which can occur over short periods, especially for species and populations, and a variety of other responses, including the rates of uptake of chemicals by living things, and the rate at which CO2 in the atmosphere dis...

includes exponential growth, which can occur over short periods, especially for species and populations, and a variety of other responses, including the rates of uptake of chemicals by living things, and the rate at which CO2 in the atmosphere dissolves in lakes, rivers, and oceans.

Uniformitarianism

the principal that physical and biological processes presently forming and modifying Earth can help explain the geologic and evolutionary history of Earth

the principal that physical and biological processes presently forming and modifying Earth can help explain the geologic and evolutionary history of Earth

Biosphere



the region of Earth where life exists

the region of Earth where life exists

Biota

is used to refer to all living things within a given area as a whole

is used to refer to all living things within a given area as a whole

Average Residence Time (ART)


ART=S/F

the average amount of time it takes for a given part of the total reservoir of a particular material to be cycled through the system

the average amount of time it takes for a given part of the total reservoir of a particular material to be cycled through the system

Organic Matter

  material, natural organic matter, NOM refers to the large pool of carbon-based compounds found within natural and engineered, terrestrial and aquatic environments.  

material, natural organic matter, NOM refers to the large pool of carbon-based compounds found within natural and engineered, terrestrial and aquatic environments.