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Children's Dictionary
aquifer a layer of rock, sand, or gravel that contains water from which wells and springs are supplied.
Arkansas a state in the south central United States. Its capital is Little Rock. (abbreviated: AR)
basalt a dark, heavy rock that is created by lava flowing from volcanoes.
bedrock the solid layer of rock in the earth's surface, found beneath soil, sand, or gravel.
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]
boulder a large, rounded rock.
cliff a high, steep face of rock or earth.
cradle to hold or rock in or as in a cradle. [1/4 definitions]
dynamite a strong explosive. Dynamite has many uses, including blasting through rock to make roads, tunnels, and mines. [1/3 definitions]
erupt of a volcano, to break open and send out hot melted rock and ash. [1/2 definitions]
fossil the remains or trace of a living animal or plant from a long time ago. Fossils are found embedded in earth or rock.
jam1 to play or improvise jazz or rock-'n'-roll music with others. [1/8 definitions]
lava hot, melted rock that erupts from a volcano. [2 definitions]
ledge a shelf of rock coming out from a wall or cliff. [1/2 definitions]
limestone a rock formed mostly from shells and other animal remains. Limestone is used in building and in making cement, lime, and carbon dioxide.
lode a deposit of a mineral that fills a crack in an area of rock.
lodestone a rock that acts as a magnet and attracts iron.
magma hot, liquid matter beneath the earth's surface that cools to form igneous rock. Magma that reaches the earth's surface, as when a volcano erupts, is called lava.
metamorphic showing or related to changes in the structure of rock. [1/2 definitions]
meteorite a piece of rock from outer space that has landed on Earth.
ore a rock or mineral from which a metal or other useful substance can be removed.