SOIL SURVEY

-175-Glacial outwash - Glaciofluvial deposits of material moved by glaciers an dsubsequently sorted and deposited by streams flowing from the melting ice .Glacial till - See till .Glaciofluvial deposits - Material moved by glaciers and subsequently sorted an ddeposited by streams flowing from the melting ice . The deposits are stratifiedand may occur in the form of outwash plains, deltas, kames, eskers, and kam eterraces . See glacial drift and till .Gleyed soil - Soil affected by gleysation .Gleysation - A soil forming process, operative under poor drainage conditions, tha tresults in reduction of iron and other elements and in gray color and mottles .Gleysolic - An order of soils developed under wet conditions and permanent o rperiodic reduction . These soils have dull colors, or prominent mottling, o rboth, in some horizons (CSSC 1976) .Grain size - The effective diameter of a particle measured by semimentation, sievin gor micrometric methods .Gravel - Rock fragments 2 mm to 10 cm in diameter .Great group - A category in the Canadian system of soil classification . It is ataxonomic group of soils having certain morphological features in commo nthat reflect a similar pedogenic environment (CSSC 1976) .Groundwater - Water that is passing through or standing in the soil and the under -lying strata . It is free to move under the influence of gravity (see water table) .Habitat - The natural environment of an organism .Herb - Any flowering plant except those developing persistent woody bases and stem sabove ground .Horizon ; soil - See soil horizon .Hue - The aspect of color that is determined by the wavelengths of light, and changeswith the wavelength . Munsell hue notations indicate the visual relationship o fa color to red, yellow, blue, green, or purple, or an intermediate of thes ehues . See also Munsell color system ; chroma; and value, color .Humic layer - A layer of highly decomposed organic soil material containing littl efiber .