Altai Mountains form a lofty range that runs northwest across the borders of western Mongolia and Kazakhstan.
Altar is a raised place or object that serves as the central point of religious worship.
Alternation of generations is a term that describes the life cycle of most plants and some algae.
Altimeter is a sensitive instrument that indicates altitude.
Altitude is the height of an object above the earth’s surface, sea level, or some other given level.
Altitude sickness is an illness experienced at high altitudes by people who are accustomed to living at much lower altitudes.
Alum is the name of a particular group of double salts.
Alumina, also called aluminium oxide, is a compound composed of aluminium and oxygen.
Aluminium, also spelled aluminum, is a lightweight, silver-coloured metal that can be formed into almost any shape.
Alzheimer’s disease is a brain disease that causes increasing loss of memory and other mental abilities.
Amadis of Gaul is a famous Spanish romance of chivalry.
Amalgam is an alloy of mercury with some other metal.
Amanites are members of a religious group called the Amana Church Society.
Amaranth is the common name of a genus (group) of plants that includes weeds, garden flowers, and crops.
Amaryllis is a family of more than 1,200 species of flowers.
Amati family was a family of violin makers who worked in Cremona, Italy, from the 1500’s to the 1700’s.
Amazon rainforest is the world’s largest tropical rainforest.
Amazon River is the world’s second longest river and the chief river of South America.
Amazons were a race of warlike women in Greek mythology.
Ambassador is the personal representative of a country’s head of state at the capital of another country.
Amber is a hard, yellowish-brown fossilized resin.
Ambergris is a waxy substance found in the intestines of some sperm whales.
Amberjack is a large, fast-swimming game fish found in warm and tropical oceans.
Ambivalence is a psychiatric term for contradictory feelings or thoughts about one’s self, another person, or a situation.
Ambrosia was a magical substance eaten by the gods of Greek and Roman mythology.
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