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1 weathering 2 7
2 nitrogen cycle 2 35
3 energy required to change temperature 1 1
4 water currents 1 1
5 abiotic factors the influence selection 1 1
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7 the polarity of water molecules is responsible for 1 1
8 ocean currents 1 31
9 millibars 1 1
10 types of sedimentary rocks 1 1
11 air pressure elevation 1 1
12 glaciation and the great lakes 1 1
13 perennial succession 1 1
14 effects of acid on plant growth 1 1
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18 the major mountain systems 1 1
19 oceanic oceanic plate 1 1
20 thunderstorms 1 18
21 type of tide 1 2
22 characteristics of intrusive igneous rock 1 2
23 sun's radiation 1 1
24 when a warm and humid airmass replaces a cold 1 1
25 potential evapotranspiration 1 1
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27 hydrological cycle 1 2
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30 what are maps used for 1 1
31 food chain 1 44
32 nitrogen cycle.com 1 1
33 theory that describes the forces that shape the earth 1 1
34 determining location from longitudinal and latitudinal coordinates 1 1
35 acid precipitation 1 3
36 the 5 types of precipitation 1 1
37 tidal cycles 1 1
38 what causes change in the gradient of a slope of bedrock 1 1
39 sedimentary rock 1 9
40 nitrogen 1 20