the line at which the sky and Earth appear to meet
beneath the B-horizon and above the bedrock; consisting of weathered rock
immediately below the A-horizon; contains deposits of organic matter leached from surface soils
the range of interest or activity that can be anticipated
the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
a specific layer or stratum of soil or subsoil in a vertical cross section of land
