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| ABC soil |
a soil made up of three distinct layers, the A, or top layer, being humus and organic matter, the B layer being clay and oxidized material, and the C layer being loose rock and mineral materials. |
| Algonkian |
the Algonkian Period, or the rock formations that date from that time. [1/4 definitions] |
| anticline |
a formation of rock layers characterized by two downward slopes going in opposite directions from a central crest. (Cf. syncline.) |
| aquifer |
a layer of rock, sand, or gravel that contains water from which wells and springs are supplied. |
| Archean |
the Archean Period, or the rock formations that date from that time. [1/2 definitions] |
| arenite |
sandstone or other rock that is composed chiefly of grains of sand. |
| Arkansas |
a state in the south central United States. Its capital is Little Rock. (abbreviated: AR) |
| badlands |
a barren region characterized by rock that has eroded into unusual shapes. |
| ballast |
gravel or crushed rock under the rails and ties of a railway to increase stability. [1/4 definitions] |
| basalt |
a dark, heavy rock that is created by lava flowing from volcanoes. |
| basin |
in geology, an area where rock strata tilt downward toward a common center. [1/6 definitions] |
| basset2 |
an emerging part or an outcrop, as of the edges of layered rock. [1/2 definitions] |
| bedrock |
the solid layer of rock in the earth's surface, found beneath soil, sand, or gravel. |
| belay |
in mountain climbing, a secure projection such as a rock, tree, or the like, around which a rope may be run or fastened. [1/6 definitions] |
| biotite |
a mica commonly found in igneous and metamorphic rock, ranging in color from dark green or brown to black, and containing iron, magnesium, potassium, and aluminum. |
| Blue Man Group |
a creative organization that provides performance-art theater in the form of a trio of blue-painted entertainers who incorporate such elements as food, odd props, rock music, and audience participation into their show. |
| blues |
(used with a singular or plural verb) a style of sad-sounding music with roots in African American folk music. Jazz and rock music developed from the blues. [1/2 definitions] |
| boogaloo |
a popular dance done to soul and rock 'n' roll music in the 1960s. |
| boogie |
strongly rhythmic rock-'n'-roll with a fast tempo, often in a blues form. [2/3 definitions] |
| boulder |
a large, rounded rock. |
| breccia |
rock consisting of sharp-angled fragments of older rocks cemented together in sandstone, clay, or the like. |
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