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ice wedging
igneous rock
immune system
impact basin
impermeable
imprinting
incandescent light
inclined plane
incoherent light
incomplete
dominance
independent
variable
index fossils
index of refraction
indicator
inertia
infectious disease
mechanical weathering process that occurs
when water freezes in the cracks of rocks
and expands, causing the rock to break
apart.
rock formed when magma or lava cools and
hardens.
complex group of defenses that protects
the body against pathogens—includes the
skin and respiratory, digestive, and
circulatory systems.
a hollow left on the surface of the Moon
caused by an object striking its surface.
describes materials that water cannot
pass through.
occurs when an animal forms a social
attachment to another organism during a
specific period following birth or
hatching.
light produced by heating a piece of
metal, usually tungsten, until it glows.
simple machine that consists of a sloping
surface, such as a ramp, that reduces the
amount of force needed to lift something
by increasing the distance over which the
force is applied.
light that contains more than one
wavelength, and travels in many
directions with its crests and troughs
unaligned.
production of a phenotype that is
intermediate between the two homozygous
parents.
factor that, as it changes, affects the
measure of another variable.
remains of species that existed on Earth
for a relatively short period of time,
were abundant and widespread
geographically, and can be used by
geologists to assign the ages of rock
layers.
property of a material indicating how
much light slows down when traveling in
the material.
organic compound that changes color in
acids and bases.
resistance of an object to a change in
its motion.
disease caused by a virus, bacterium,
fungus, or protist that is spread from an
infected organism or the environment to
infrared waves
inhibitor
innate behavior
inorganic compound
insight
instantaneous speed
instinct
insulator
integrated circuit
intensity
interference
internal combustion
engine
intertidal zone
intrusive
invertebrate
involuntary muscle
ion
another organism.
electromagnetic waves that have a
wavelength between about 1 mm and 750
billionths of a meter.
substance that slows down a chemical
reaction or prevents it from occurring by
combining with a reactant.
behavior that an organism is born with
and does not have to be learned, such as
a reflex or instinct.
compound, such as H2O, that is made from
elements other than carbon and whose
atoms usually can be arranged in only one
structure.
form of reasoning that allows animals to
use past experiences to solve new
problems.
speed of an object at a given point in
time; is constant for an object moving
with constant speed, and changes with
time for an object that is slowing down
or speeding up.
complex pattern of innate behavior, such
as spinning a web, that can take weeks to
complete.
material in which electrons are not able
to move easily.
tiny chip of semiconductor material that
can contain millions of transistors,
diodes, and other components.
amount of energy that flows through a
certain area in a specific amount of
time.
occurs when two or more waves overlap and
combine to form a new wave.
heat engine that burns fuel inside the
engine in chambers or cylinders.
part of the shoreline that is under water
at high tide and exposed to the air at
low tide.
describes a type of igneous rock that
generally contains large crystals and
forms when magma cools slowly beneath
Earth’s surface.
animal without a backbone.
muscle, such as heart muscle, that cannot
be consciously controlled.
electrically-charged atom whose charge
results from an atom losing or gaining
electrons.
ionic bond
ionization
ionosphere
isobars
isomers
isotherm
isotopes
attraction formed between oppositely
charged ions in an ionic compound.
process in which electrolytes dissolve in
water and separate into charged
particles.
layer of electrically charged particles
in the thermosphere that absorbs AM radio
waves during the day and reflects them
back at night.
lines drawn on a weather map that connect
points having equal atmospheric pressure;
also indicate the location of high- and
low-pressure areas and can show wind
speed.
compounds with identical chemical
formulas but different molecular
structures and shapes.
line drawn on a weather map that connects
points having equal temperature.
atoms of the same element that have
different numbers of neutrons.