List of Words for Letter ‘A’

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abiotic factor A nonliving part of an ecosystem.
acceleration Any change in the speed or direction of a moving object.
accommodation An individual organism’s response to changes in its ecosystem.
acid A substance that tastes sour and turns blue litmus paper red.
acid rain rain caused by the burning of fossil fuels.
adaptation A trait that helps one kind of living thing survive in its environment
air mass A large region of the atmosphere where the air has similar properties throughout.
air pressure The force of air pushing down on an area.
alloy A mixture of one metal with one or more metals or substances.
amber Hardened tree sap, yellow to brown in color, that is often a source of insect fossils.
amphibian A cold-blooded vertebrate that spends part of its life in water and part of its life on land.
amplitude The energy in a sound wave.
area The number of unit squares that fit inside a surface.
arthropod An invertebrate with jointed legs, a body that is divided into sections, and an exoskeleton.
asteroid A chunk of rock or metal that orbits the Sun.
atmosphere The blanket of gases that surrounds Earth.
atom The smallest particle of an element. All atoms of one element are alike, but are different from those of any other element.
attract To pull.
avalanche A large, sudden movement of ice and snow down a hill or mountain.
axis A real or imaginary line that a spinning object turns around.