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Unit 2
The Non-Living Environment
22
Biology
8th Grade
04/20/2012

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Term
abiotic
Definition
nonliving factors in an ecosystem (ex. sunlight, water, air)
Term
nitrogen gas
Definition
the most common gas in Earth's atmosphere
Term
biotic factor
Definition
living or once-living parts of an ecosystem
Term
humus
Definition
decaying matter found in soil
Term
coal, oil, natural gas
Definition
types of fossil fuels
Term
nitrogen
Definition
a key ingredient of DNA and protein
Term
sunlight
Definition
the beginning energy source for most life on Earth
Term
legumes (beans, peas, peanuts)
Definition
the type of plant that helps to add nitrogen to soil
Term
compost, animal manure, chemical fertilizer, planting legumes
Definition
ways to add nitrogen to soil
Term
evaporation
Definition
when liquid water becomes a gas
Term
condensation
Definition
when water vapor becomes a liquid
Term
nitrogen & oxygen
Definition
the two most adundant gases in the atmosphere
Term
transpiration
Definition
when water becomes water vapor as it exits plant leaves
Term
respiration
Definition
when animals remove oxygen from the atmosphere
Term
nitrogen fixation
Definition
When bacteria change nitrogen from the atmosphere into a form that can be used by living things.
Term
carbon cycle
Definition
The cycle that is associated with the theory of global warming
Term
Climax Community
Definition
The species that represents the final stages of succession
Term
Deciduous Forest (Oak & Hickory)
Definition
Example of a climax community in PA
Term
Primary Succession
Definition
the regrowth of life after a major disturbance- even soil must form
Term
Secondary Succession
Definition
The regrowth of life after a disturbance- soil remains
Term
Making Soil
Definition
The first step of primary succession
Term
Pioneer Species
Definition
The first species to live in a disturbed area
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