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abyssal plain - The ocean floor offshore from the continental margin, usually very flat with a slight slope.accrete - To add terranes (small land masses or pieces of crust) to another, usually larger, land mass. age - A unit of geological time shorter than an epoch, usually lasting several million years.angle of repose - The steepest slope angle in which particular sediment will lie without cascading down.angstrom - A length of 10 meter or one hundred millionth of a centimeter. angular unconformity - An unconformity in which the bedding planes of the rocks above and below are not parallel.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.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.
alkali metal - A strongly basic metal like potassium or sodium.anthracite - The most highly metamorphosed form of coal, containing 92 to 98 percent of fixed carbon. anticline - A fold of rock layers with a convex shape pointing upwards. aphanitic - An igneous rock in which the matrix grains are too small to be seen with the unaided eye. aquifer - A permeable formation that stores and transmits groundwater in sufficient quantity to supply wells.archipelago - A group of islands; an expanse of water with scattered islands.Geological analysis relies mainly on chemistry, physics and mathematics. a'a' lava - basaltic lava characterized by a rough or rubbly surface composed of broken lava blocks called clinker.A-horizon - The uppermost layer of a soil, containing organic material and leached minerals.