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Unit 1:
Ch. 1
Ch. 2
Ch. 3
Interlude A
Unit 2:
Ch. 4
Ch. 5
Ch. 6
Ch. 7
Ch. 8
Ch. 9
Interlude B
Unit 3:
Ch. 10
Ch. 11
Ch. 12
Ch. 13
Ch. 14
Ch. 15
Interlude C
Unit 4:
Ch. 16
Ch. 17
Ch. 18
Ch. 19
Interlude D
Unit 5:
Ch. 20
Ch. 21
Ch. 22
Ch. 23
Ch. 24
Ch. 25
Ch. 26
Ch. 27
Ch. 28
Ch. 29
Ch. 30
Interlude E
Unit 6:
Ch. 31
Ch. 32
Interlude F
Unit 7:
Ch. 33
Ch. 34
Ch. 35
Ch. 36
Ch. 37
Ch. 38
Interlude G
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  • water transformation: Changes made by humans to the waters of Earth that alter their physical or biological characteristics. Compare land transformation.
  • weather: Temperature, precipitation, wind speed, humidity, cloud cover, and other physical conditions of the lower atmosphere at a specific place over a short period of time. Compare climate.
  • wetland: An aquatic biome, the communities of which live in shallow waters that flow slowly over lands that border rivers, lakes, or ocean waters.
  • white blood cell: Any of several types of cells that are part of an animalís nonspecific and specific internal defenses against pathogens.
  • wood: A series of layers of secondary xylem. Each new layer forms a ring around the previous yearís layer, producing the "tree rings" that can be used to age a tree.

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