20/20 vision, 590
Tyrannosaurus rex, 681
ultrasound, 516
umbra, 804
unbalanced forces, 358
uniform motion, 336
uniformitarianism, 661
universe, 830–865
unsaturated hydrocarbons, 266
upwelling, 728
Ursa Major, 850
vacuum, light in, 574
valence electrons, 139
valley glacier, 719
valleys
vapor pressure, 89
of petroleum, 268
variables, types of, 8
vector, 330
resultant, 331
vector addition, 337
velocity, 336–337
vent, volcanic, 691
vernal equinox, 754
vibration, of particles in solids, 74
video surveillance, 579
Viking space probes, 810
vinyl records, 519
Virgo Cluster, 854
viscosity, 45
of magma, 692
vision problems, correcting, 590–592
vitamin C, in fruit juices, 285
vitamin D, 544
vitamins, 284
volcanic necks, 696
volcanic rocks, 695
volcanoes, 690–696
voltage, 606–607
volume, 16
V-shaped valleys, 715
warm fronts, 768
waste heat, 483
acid-base property of, 245
composition of, 40
compression of, 67
fresh, 706–708
heat of fusion of, 86
heat of vaporization of, 88
on Mars, 812
mass vs. volume graph of, 23
molecules of, 88
from neutralization
reactions, 244
percentage of body mass, 147
phases of, 84
purifying, 52–53
resources, 708
synthesis of, 200
transparency of, 546
water cycle, 705–706
water deposition, 716
water erosion, 714–716
waterfall, 715
water pressure, 391
watershed (drainage basins), 706–707
water table, 707
wave fronts, 509
waves. See also electromagnetic
waves; light; mechanical
waves; sound.
wave speed, 505–506
weak nuclear force, 380
weather balloons, 81
weathering, 710–712
weather systems, 768
Web Codes. See Go Online.
weight, 357, 367, 368–369, 398–399
calculating, 368
weighted averages, 134
whales, noise pollution and, 513
white blood cells, 250
Whitney, Eli, 422
wildfires, 210–211
Wilson, Robert, 858
WIMPs, 855
wind deposition, 724
wind energy, 464
wind erosion, 723
wind turbines, 465
wings, 396–397
Winter Triangle, 840
Wöhler, Friedrich, 262
wood, arsenic-treated, 59
carving of, 47
wool, properties of, 38
work, 412–414
work input, 419
work output, 420
Writing in Science, 6, 11, 44, 91, 105, 115, 118, 129, 138, 179, 181, 205, 215, 239, 249, 280, 284, 301, 305, 313, 331, 375, 377, 382, 404, 423, 435, 466, 492, 512, 519, 545, 553, 573, 583, 592, 603, 607, 647, 663, 675, 681, 696, 717, 724, 754, 777, 811, 813, 824, 837, 848
x-axis (horizontal axis), 23
xenon, 145
y-axis (vertical axis), 23
Yosemite Valley, 721
Young, Thomas, 536