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banded iron formation - Rock consisting of alternating light and dark layers of iron-rich chert (hematite and limonite) formed approximately 3,800 million years ago.bank - The land alongside or sloping down to a river or lake.bankfull stage - The height of water in a stream that just corresponds to the level of the surrounding floodplain.bar - A unit of pressure equal to 10 to the sixth dynes/square centimeter; approximately one atmosphere.astrobleme - A circular erosional feature that has been ascribed to the impact of a meteorite or comet.atmosphere (unit) - A unit of pressure equal to 101,325 newtons per square meter, or about 14.7 pounds per square inch.atoll - A continuous or broken circle of coral reef and low coral islands surrounding a central lagoon.

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basalt - A fine-grained, dark, mafic igneous rock (~50% Si O) composed largely of plagioclase feldspar and pyroxene; rough volcanic equivalent of gabbro.anorthosite - An igneous rock predominantly composed of plagioclase feldspar (90–100%), and a minimal mafic component (0–10%).Anorthosites constitute the light-colored areas of the Moon's surface.arroyo - A steep-sided and flat-bottomed gully in an arid region that is occupied by a stream only intermittently, after rains.artesian well - A well that penetrates an impermeable layer of rock to reach an aquifer containing water under pressure.

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