a navigational instrument based on a gyroscope; it artificially provides a simulated horizon for the pilot
immediately below the A-horizon; contains deposits of organic matter leached from surface soils
beneath the B-horizon and above the bedrock; consisting of weathered rock
the line at which the sky and Earth appear to meet
a specific layer or stratum of soil or subsoil in a vertical cross section of land
the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
a Greek sandwich: sliced roast lamb with onion and tomato stuffed into pita bread
rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction
