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22 Cards in this Set
- Front
- Back
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nitrogen cycle
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movement of nitrogen from the nonliving environment to living environment into living things and back again
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nitrogen fixation
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process of changing unbonded nitrogen gas into usable forms of nitrogen
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carbon cycle
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movement of carbon from nonliving environment to living and back again
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water cycle
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continuous cycle where water moves from oceans to atmosphere to land structure and back again
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rock cycle
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environmental processes that continuously forms and changes rock
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natural selection
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process by which individuals w/ favorable traits survive and reproduce
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adaptation
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characteristic that improves an organism's ability to survive in its environment
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evolution
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change in genetic material of a population from one generation to the next
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global warming
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gradual increase in temp of the earths atmosphere
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what do scientists believed caused the dinosaurs to become extinct?
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an asteroid, created clouds of dirt in atmosphere blocking the sunlight
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put the geologic eras in order from oldest to most recent (4)
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precambrian, paleozoic, mesozoic, cenozic
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we live in what era? dinosaurs? trilobites? 1st living organisms?
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cenozoic; mesozoic; paleozoic; precambrian
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charles darwin's major contribution?
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natural selection
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how does geologic isolation help form new species?
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since not in usual place, they adapt/ gain new traits
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how did scientists learn about species living long ago?
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fossil record
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how do human activities affect carbon cycle?
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burning of fossil fuels release CO2; increase CO2 levels; thought responsible for global warming
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the energy that drives the carbon cycle...
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the sun
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why is nitrogen-fixing bacteria important to most living organisms?
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w/o them, organisms wouldn't be able to use nitrogen
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why is water a 'scarce' resource?
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97% of all water on earth is salt water-not usable
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how do humans negatively affect the water cycle?
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higher temp=more evaporation, mining, oil
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how do humans negatively affect the carbon cycle?
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deforestation->more CO2, greenhouse effect, pollution/ burning of fossil fuels
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conditions that change btwn each: igneous->sedimentary; metamorphic->igneous;
sedimentary->metamorphic |
I->S=erosion
M->I=melting S->M=heat & pressure |
