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03-Jun-2019 03:34

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.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.barrier island - A long, narrow island parallel to the shore, composed of sand and built by wave action.basalt - A fine-grained, dark, mafic igneous rock (~50% Si O) composed largely of plagioclase feldspar and pyroxene; rough volcanic equivalent of gabbro.amber - A fossilized resin from a coniferous tree that sometimes contains entrapped and preserved insects.amphibole - group of generally dark-colored rock-forming inosilicate minerals, composed of double chain Si O), less mafic than basalt, but more mafic than dacite; rough volcanic equivalent of diorite.

arkose - A variety of sandstone containing abundant feldspar and quartz, frequently in angular, poorly sorted grains.angle of repose - The steepest slope angle in which particular sediment will lie without cascading down.