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The glossary
uses letters and signs to
show how words are pronounced. The
mark
is placed after a syllable with a
primary or heavy accent. The mark
is
placed after a syllable with a secondary
or lighter accent. |
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To hear these
words pronounced, listen
to the AudioText CD. |
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acceleration (ak
sel
rshn)
the rate at
which
the velocity of an object changes
over
time (p.
422) |
adaptation (ad
ap t
shn)
a change in an
organism
to better fit an ecosystem (p.
172) |
air mass (âr
mass) a large body of air with
similar
properties all through it (p.
234) |
air pressure (âr
preshr)
the push of gases
against
a surface (p.
208) |
air sacs (âr
saks) tiny thin-walled pouches in
the
lungs (p.
70) |
anemometer (an
mom
tr)
a tool used to
measure
wind speed (p.
242) |
aquifer (ak
w
fr)
the layer of rock and soil
that
groundwater flows through (p.
203) |
artery (är
tr
)
a type of blood vessel that
carries
blood away from the heart to other
parts
of the body (p.
66) |
assembly line (
sem
bl
ln)
a way of
building
a product in which workers add
parts
to products moving down a conveyor
belt
(p.
578) |
asteroid (as
t
roid)
a rocky mass up to
several
hundred kilometers wide that
revolves
around the Sun (p.
554) |
atmosphere (at
m
sfir) the layer of gases
that
surrounds Earth and other planets
(p.
545) |
atom (at
m)
the smallest particle of an
element
that has all the properties of the
element
(p.
348) |
axis (ak
sis) an imaginary center line around
which
the Earth rotates (p.
544) |
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barometer (b
rom
tr)
a tool used to
measure
air pressure (p.
242) |
behavioral adaptation
(bi h
vyr
l
ad
ap ta
shn)
inherited behavior that
helps
animals survive (p.
173) |
biomass (b
mas)
remains of anything
that
lived recently (p.
313) |
black hole (blak
hl)
a point in space that
has
such a strong force of gravity that
nothing
within a certain distance of it can
escape
(p.
523) |
bronchioles (brong
k
lz)
tubes that branch
out
from the bronchi (p.
70) |
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capillary (kap
ler
)
the smallest kind of
blood
vessel (p.
66) |
carnivore (kär
n
vôr) an animal that eats
only
other animals (p.
144) |
| cause (kz)
why something happens (p.
93) |
cell membrane (sel
mem
brn)
surrounds a
cell,
allows certain materials to enter the
cell
and waste products to exit (p.
40) |
cell respiration (sel
resp
r
shn)
the
combining
of oxygen and food, such as
sugar,
in order to get energy (p.
39) |
cell wall (sel
wl)
tough material surrounding
the
cell membrane in plant cells that provides
support
and protection (p.
40) |
change of state (chnj
ov stt)
phase change,
or
the change of matter from a solid, liquid,
or
gas into another state or phase (p.
462) |
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