| biosphere |
the part of the earth and its atmosphere in which living organisms can exist. |
| bog |
an area of soft, wet earth and decayed vegetation; marsh. [1/2 definitions] |
| border |
a strip of earth or a rectangular flower bed planted with decorative flowers or shrubbery. [1/6 definitions] |
| bulldoze |
to move (earth) or clear out (land) using a bulldozer. [1/2 definitions] |
| bulwark |
a wall or wall-like structure, often made of earth and used for defense; rampart. [1/4 definitions] |
| burrow |
to dig into or in the earth. [1/5 definitions] |
| calcium |
a chemical element of the alkaline-earth group that has twenty protons in each nucleus and occurs widely in nature, but only in compounds such as calcite or limestone. (symbol: Ca) [1/2 definitions] |
| cave |
a natural hollow or series of hollows in the earth, esp. one with an opening in a hillside or cliff. [1/4 definitions] |
| celestial sphere |
the infinitely large, imaginary sphere around the earth in which the stars, planets, and other celestial objects seem to be located. |
| cerium |
a highly reactive chemical element of the rare-earth group that has fifty-eight protons in each nucleus and that occurs naturally only in compounds. (symbol: Ce) |
| chute3 |
to descend to the earth by parachute. [1/3 definitions] |
| circumpolar |
moving around or close to one of the poles of the earth or of the celestial sphere. |
| circumterrestrial |
revolving around or surrounding the earth. |
| cislunar |
lying between the earth and the moon's orbit; on this side of the moon. |
| clay |
earth that consists mainly of hydrated silicates of aluminum, and is used for making bricks, pottery, and tiles. [3 definitions] |
| cliff |
a high, steep or overhanging surface of rock or earth. |
| clime |
in literary use, a region of the earth, or the typical weather conditions thereof. |
| clod |
a lump of earth or clay. [1/2 definitions] |
| coal |
a hard black or dark brown substance found in the earth and burned as fuel. [1/3 definitions] |
| coal mining |
the industry, act, or process of digging coal out of the earth. |
| conjunction |
in astronomy and astrology, the lining up of two or more celestial bodies, esp. the sun and a planet, along a line as viewed from Earth. [1/4 definitions] |