List of Words for Letter ‘A’
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absolute age A rock’s age in years.
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absorption The transfer of energy when a wave disappears into a surface.
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acceleration Change in velocity with respect to time.
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acid A substance that tastes sour and turns blue litmus paper red.
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acidity The strength of an acid.
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action force The initial push or pull of one object on another object.
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adaptation A characteristic that helps an organism to survive in its environment.
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air mass A large region of the atmosphere
in which the air has similar properties.
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air pressure The force put on a given area by the weight of the air above it.
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alkalinity The strength of a base. A solution of a metal and at least one other solid which is often also a metal.
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alloy A solution
of a metal and at least one
other solid which is often also a metal.
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alternating current Electric current that changes directions many times per second.
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alternative energy source A source of energy other than the burning of a fossil fuel.
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amplitude The height of a sound wave, which determines its volume.
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angiosperm TA seed plant that produces flowers.
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aquifer An underground layer of rock or soil filled with water.
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asexual reproduction The production of new organisms from only one parent.
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asteroid One of many small, rocky objects between Mars and Jupiter.
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asymmetrical Cannot be divided into mirror images.
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atmosphere The layers of gases that surround Earth. The smallest unit of an element that has the properties of that element.
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atom The smallest unit of an element that
has the properties of that element.