Absorption	107, 108
Acoustics	107
Alternate Explanation	45
amplitude	26, 105, 106, 108
analyzing	89, 95
ancient life forms	68
area	22, 85
Aristotle	81
astronomy	94
atmosphere	28, 131, 133
atomic makeup	81
atoms	22, 24, 81, 85, 89, 93
attract	96, 98
axis	133
balances	85
balancing devices	39
basin	114
beaches	114
binoculars	104
'Bird's-eye' View	111
bond	22, 81, 85
books	36
brain	103
buoyant forces	95
cameras	104
carbon cycle	77
carbon dioxide	75
centimeter	39
change	112
changes in state	88, 90
characteristcs	28
chemical(s)	23, 39, 68
chemical changes	23, 88, 92
chemical energy	85
chemical weathering	114
chromatography	88
circuits	23, 83, 85
classify	22
color(s)	104
comet(s)	29, 130, 133
comet tail	133
common themes	45
compare	25, 29, 133
components	85, 88
composition(s)	27, 131, 133
compounds	22
compression	115
concentrated	104
conclusion(s)	38, 39, 45
condensation(condensing)	23, 87, 88, 89, 92
conductor	83
conservation of energy	85
constellation(s)	133
continental	115
continental divide	114
contraction	23, 92
convection	115
cooling	114
cornea	107
core	115
cosmologist	131
crust	115
curved path	98
cycle	75, 77, 106
data	38, 45
day	29, 133
decomposition	114
degrees Fahrenheit	114
degrees Celsius	114
deltas	114
density	80
deposition	114
describe	17, 22, 23, 29
deserts	114
design	15
dew	87
diagrams	38
diffusion	108
dimensions	22, 85, 95, 98
direction	25
dissolving	88
distances	
dust	
earth	27, 29, 105, 112, 113, 114, 131, 133
earthquakes	105, 115
earth's surface	28
echo	25, 107
eclipses	130
electric current	83
electrical circuits	85
electrical energy	23, 85
electrical fields	83, 96, 105
electrically charged	98
electricity	79
electromagnetic spectrum	105
electromagnetic waves	105
electron flow	23, 85
elements	22, 85, 131, 133
elevation	114
emission	108
energy	23, 25, 79, 82, 85, 90, 106, 108
energy of motion	82
energy transmission	85
emission	108
environment(s)	43, 105, 107
erosion	112, 114
experimental procedures	36
experimental studies	35
explain	15, 29
exploration	133
extreme	133
evaporation	23, 87, 88, 89, 92
evidence	42, 45
eye	107
faults	115
features	114, 115
feedback models	45
field studies	35
flow diagrams	16, 39
folded mountains	115
forces	25, 112, 114, 115
forms of energy	85
formulas	16, 39
fossils	27, 70, 114
freezing	88, 90
frequency	26, 105, 106, 108
figures	39
friction	106
frozen gases	133
frozen water	114
galaxy	131
Galileo	94
gamma rays	105
gases	22, 81, 85, 90, 92, 107, 131, 133
geologic time	70
geological history	27, 114
glaciers	114
glasses	104
graduated cylinders	85
gram	39, 85
graphs	36, 38, 39
gravity	25, 80, 114, 130, 131, 133
gravitational pull	98
Great Lakes	114
heat	23, 106, 112, 114, 133
heat energy	85
'Heat waves'	See Infrared Light
hot spots	115
hypothesis	38
illumination	107
illustrations	36
inclined plane (simple machine)	98
inertia	130
infer	68
information	36, 39
infrared light	105
interior(s)	114, 131, 133
instructions	39
investigation(s)	15, 38, 39
iris	107
journal articles	36
journals	38
Kepler	94
kilogram	85
kinetic energy	94, 106
knowledge	35
laboratory	39
land	113
landforms	114
lava	112, 114
length	85
lens	107
lenses	108
lever	98
libraris	39
life forms	68
light	23, 26, 85, 102, 104, 108, 133
light source	107
limitations	17
liquids	22, 81, 85, 90, 92, 107
listening	36
liter(s)	39, 85
longitudinal energy	108
lunar	133
magnetic compass	85
magnetic energy	85
magnetic field	23, 83, 85, 96, 105
magnetic materials	98
magnetic poles	85
magnetism	23, 79
magnets	25, 83, 98
magnifying lens	108
mantic	115
maps	27, 114, 133
mass	22, 80, 85
mathematics	17
matter	79, 80, 81, 87, 88, 89, 102
measure	22, 85
measurement devices	15, 39
measuring cups	39, 85
measuring tapes	39
measuring units	39
mechanical energy	23, 85
mechanical waves	105
medium (a) 	25, 105, 108
melting	112, 114
melting temperature	90
meter	39
metric ruler	85
microscopes	104, 108
microwaves	105
mid-ocean ridges	115
Milky way	133
Milliliters	39
Millimeter	39
minerals	27, 112, 114
mirror(s)	108
misconceptions	103
mixtures	22, 85
models	89, 90
molecular arrangement	85
molecular distance	85
molecular motion	85
molecules	22, 24, 81, 85, 90, 93, 106, 133
moon phases	133
moon(s)	29, 130, 131, 133
motion(s)	25, 26, 29, 95, 98, 130, 133
mountain range (mountain chain)	114
mountains	114
multicultural	44
navigation	107
negative charge	98
Newton's first law	130
night	29, 130
north pole	98
nuclear energy	23, 85
object	133
observation(s)	15, 29, 38, 39, 81, 95, 102, 113, 133
ocean floor	114
oceanic	115
oceans	113
opaque	108
optic nerve	103, 107
orbit	130
origins	131
oscillating objects	105, 106
oxygen	77
past (life forms)	20
pendulums	26, 108
period	108
phase	88, 90
phases (of the moon)	130
phenomenon (a)	130
physical	68
physical change	23, 88, 92, 93
physical properties	22, 85
physical weathering	114
physics	94
plains	114
planetary	133
planets	29, 131, 133
plastics	89, 92
plateaus	114
polarized objects 	98
positive charge	98
potential energy	82, 106
pressure	112, 114, 115
prism(s)	108
problem(s)	39
procedure(s)	16, 39
product(s)	23, 92
properties	23, 81, 88, 90, 92
pulley (simple machine)	98
pupil	107
purpose	34, 39
qualitatively	25, 98
questions	34
radiowaves	105
rainbow	104
random	85
ratio	80
reactants	23, 92
reading	36
recipe	16, 39
reflect (reflected, reflection)	26, 103, 107, 108
refract (refraction)	26, 104, 108
relative ages	133
relative dating	133
relative distances	133
relative sizes	133
relief	114
repel	96, 98
research	39
retina	103, 107
rings	133
rivers	114
rock layers	114
rock(s)	27, 112, 114
rocky	133
safety	15, 38
sampling	45
sand	114
satellites	94
scattering (light)	108
science	43
science fiction	132
scientific concepts	38
scientific contexts	38
scientific equipment	36
scientific ideas	42, 43
scientific information	39
scientific inquiry	33
scientific knowledge	33, 38, 43
scientific questions	15, 38
scientific theory(ies)	43, 105
scientifically literate	6, 7, 33, 42, 81, 88, 103, 105, 113 
scientists	33, 35, 43, 89
screw (simple machine)	98
seafloor spreading	115
sediments	114
seismic waves	105
simple circuits	83
simple machines	25, 96, 98
sketches	16, 39
sky(ies)	29, 133
soil	114
solar stills	88
solar system	29, 131, 133
solid(s)	22, 81, 85, 90, 92, 107, 133
solutions	88
solve	15
sonar	107
sonic booms	107
sound	23, 25, 85, 105, 107
south pole	98
space shuttle	132
spacecraft	133
speed	25
spin(ning)	133
spring scales	85
star(s)	
star explosions	131, 133
star formation	131, 133
states of matter	81, 90, 92, 93
static electricity	83
streams	114
sun	131, 133
surface features	27
swamps	114
system-subsystems	45
tables	36, 38, 39
technical manuals	36
technological systems	24, 92
technology	17, 27, 43, 45, 89
telescope(s)	104, 108, 133
television signals	105
temperature	22, 85, 115, 131, 133
tension	115
test	38
themes	17
theories	34
thermal expansion	23, 92
thermometers	85
three dimensions	25
time	111, 112
time lines	114
topography (topographic)	114
translucent	103, 108
transmission	108
transparent	103, 104, 107, 108
transverse waves	108
trenches	115
ultrasound	105
ultrasound imaging	107
ultraviolet	105
unbalanced forces	25
universe	131, 133
vacuum	105
variable(s)	106
vibrating objects	26, 105, 106, 108
vibrations	85, 105
visible light	105
vitreous humor	107
vocabulary	35
volcanos	112, 115
volume	22, 80, 85
water	75
water cycle	28, 77
water waves	105
wavelength	104, 105, 106
wave velocity	106
waves	26, 114
weather	28
weathering	114
weather patterns	28
wedge (simple machine)	98
weight	22, 80, 85, 98
wheel & axle (simple machine)	98
wind	114
written information	36
x-rays	105
year	133