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air the mixture of gases that surrounds the earth. Air is made up of oxygen, nitrogen, and other gases, and has no taste, odor, or color. [1/6 definitions]
alien from a planet other than Earth; extraterrestrial. [1/5 definitions]
altitude the height of a thing above earth or above sea level.
anthill a pile of earth made by ants as they dig their underground nest. Anthills are found near the nest entrance.
Arctic Circle an imaginary line drawn around the earth parallel to the equator which marks the boundary of the Arctic. North of this line there are periods of continuous night in the winter and continuous day in the summer.
astronomer a scientist who studies the universe beyond the earth.
astronomy the branch of science that studies the universe beyond the earth.
atmosphere the gases surrounding the earth or other similar objects in outer space. [1/3 definitions]
atmospheric of, relating to, or made of the gases that surround the earth.
bacteria microscopic organisms that often play a role in the decay of living things, the process of fermentation, and sometimes in causing disease. Bacteria are each made up of only one cell, but different kinds of bacteria can take different shapes. These organisms live in all parts of the earth including oceans, deserts, glaciers, hot springs, and in the bodies of most living things. While some kinds of bacteria are dangerous, most kinds are useful because they help in the digestion of food, in the making of soil, in the creation of medicines, and in many other natural processes.
bog an area of soft, wet earth; marsh. [1/2 definitions]
border a strip of earth planted with flowers or bushes. [1/5 definitions]
burrow to dig into or in the earth. [1/3 definitions]
cave a natural hole or hollow in the earth. Many caves have openings in a hillside or cliff.
clay moist, stiff earth that is used for making brick, pottery, and tile.
cliff a high, steep face of rock or earth.
clod a lump of earth or clay. [1/2 definitions]
coal a hard black or dark brown substance that is found in the earth and burned as fuel. [1/2 definitions]
crust the outer layer of Earth, another planet, or a moon. [1/5 definitions]
Dead Sea a large salt lake between the countries of Israel and Jordan. The Dead Sea lies at about 1300 feet below sea level, which makes it the lowest known place on the surface of the earth.
dirt loose earth or soil. [1/2 definitions]