Abiotic Physical rather than biological; not derived from living organisms.

Acceleration Increase in the rate or speed of something

Accuracy The quality or state of being correct or precise
Acid A chemical substance that neutralizes alkalis, dissolves some metals, and
turns litmus red; typically, a corrosive or sour-tasting liquid of this kind
Activation Energy The minimum quantity of energy that the reacting species must possess in
order to undergo a specified reaction.
Adaptation The action or process of adapting or being adapted
Air Resistance
Allele One of two or more alternative forms of a gene that arise by mutation and
are found at the same place on a chromosome.
Amino Acids A simple organic compound containing both a carboxyl (−COOH) and an
amino (−NH 2) group.
Amplitude The maximum extent of a vibration or oscillation, measured from the
position of equilibrium.
Aqueous Of or containing water, typically as a solvent or medium
Asexual
Reproduction
Astronomical A unit of measurement equal to 149.6 million kilometers, the mean distance
Unit from the center of the earth to the center of the sun.
Atmosphere The envelope of gases surrounding the earth or another planet
Atom The basic unit of a chemical element
Atomic Number The number of protons in the nucleus of an atom, which determines the
chemical properties of an element and its place in the periodic table
Axis An imaginary line about which a body rotates
Base The lowest part or edge of something, esp. the part on which it rests or is
supported
Biodiversity The variety of life in the world or in a particular habitat or ecosystem.
Biome A large naturally occurring community of flora and fauna occupying a
major habitat, e.g., forest or tundra.
Biotic Of, relating to, or resulting from living things, esp. in their ecological
relations
Calorie The energy needed to raise the temperature of 1 gram of water through 1 °C
Carnivore An animal that feeds on flesh
Catalyst A substance that increases the rate of a chemical reaction without itself
undergoing any permanent chemical change.
Centrifugal Force An apparent force that acts outward on a body moving around a center,
arising from the body's inertia
Centripetal Force A force that acts on a body moving in a circular path and is directed toward
the center around which the body is moving.
Change of State

Chemical Change
Chemical
Weathering
Circuit A roughly circular line, route, or movement that starts and finishes at the
same place
Community A group of people living together in one place, esp. one practicing common
ownership
Compound A thing that is composed of two or more separate elements; a mixture
Concentration The action or power of focusing one's attention or mental effort
Condensation Water that collects as droplets on a cold surface when humid air is in
contact with it.
Conduction The process by which heat or electricity is directly transmitted through a
substance when there is a difference of temperature or of electrical potential
between adjoining regions, without movement of the material.
Conservation Preservation, protection, or restoration of the natural environment, natural
ecosystems, vegetation, and wildlife
Conservation of
Energy
Conservation of
Mass
Constellation A group of stars forming a recognizable pattern that is traditionally named
after its apparent form or identified with a mythological figure
Consumer A person who purchases goods and services for personal use.
Convection The movement caused within a fluid by the tendency of hotter and therefore
less dense material to rise, and colder, denser material to sink under the
influence of gravity, which consequently results in transfer of heat.
Convergent
Boundary
Covalent Bond
Crest A comb or tuft of feathers, fur, or skin on the head of a bird or other animal.

Crust Form into a hard outer layer

Decomposer An organism, esp. a soil bacterium, fungus, or invertebrate, that decomposes
organic material.
Density The degree of compactness of a substance
Dependent A variable (often denoted by y) whose value depends on that of another
Variable
Deposition The action of depositing something
Diffraction The process by which a beam of light or other system of waves is spread out
as a result of passing through a narrow aperture or across an edge, typically
accompanied by interference between the wave forms produced
DNA Deoxyribonucleic acid, a self-replicating material present in nearly all living
organisms as the main constituent of chromosomes. It is the carrier of
genetic information.
Dominance Power and influence over others
Earthquake A sudden and violent shaking of the ground, sometimes causing great
destruction, as a result of movements within the earth's crust or volcanic
action.
Ecosystem A biological community of interacting organisms and their physical
environment.
Efficiency The state or quality of being efficient
Electromagnet A soft metal core made into a magnet by the passage of electric current
through a coil surrounding it.
Electromagnetic of or relating to the interrelation of electric currents or fields and magnetic
fields.
Radiation The emission of energy as electromagnetic waves or as moving subatomic
particles, esp. high-energy particles that cause ionization.
Electromagnetic
Waves
Electron A stable subatomic particle with a charge of negative electricity, found in all
atoms and acting as the primary carrier of electricity in solids
Element A part or aspect of something abstract, esp. one that is essential or
characteristic
Energy The strength and vitality required for sustained physical or mental activity
Energy Pyramid
Energy Transfers
Entropy A thermodynamic quantity representing the unavailability of a system's
thermal energy for conversion into mechanical work
Environment The surroundings or conditions in which a person, animal, or plant lives or
operates.
Equator An imaginary line drawn around the earth equally distant from both poles,
dividing the earth into northern and southern hemispheres and constituting
the parallel of latitude 0°.
Erosion The process of eroding or being eroded by wind, water, or other natural
agents
Evaporation Turn from liquid into vapor
Experiment A scientific procedure undertaken to make a discovery, test a hypothesis, or
demonstrate a known fac
Fault An unattractive or unsatisfactory feature, esp. in a piece of work or in a
person's character

First law of
Thermodynamics
Food chain A hierarchical series of organisms each dependent on the next as a source of
food
Food web A system of interlocking and interdependent food chains
Force Strength or energy as an attribute of physical action or movement
Fossils The remains or impression of a prehistoric organism preserved in petrified
form or as a mold or cast in rock.
Fossil fuels A natural fuel such as coal or gas, formed in the geological past from the
remains of living organisms
Frequency The rate at which something occurs or is repeated over a particular period of
time or in a given sample
Friction The resistance that one surface or object encounters when moving over
another
Fulcrum The point on which a lever rests or is supported and on which it pivots.
Galaxy A system of millions or billions of stars, together with gas and dust, held
together by gravitational attraction.
Gas An airlike fluid substance which expands freely to fill any space available,
irrespective of its quantity
Gene A unit of heredity that is transferred from a parent to offspring and is held to
determine some characteristic of the offspring
Genotype The genetic constitution of an individual organism.
Gravitation Movement, or a tendency to move, toward a center of attractive force, as in
the falling of bodies to the earth

Gravity The force that attracts a body toward the center of the earth, or toward any
other physical body having mass.