horizon

nouns

the line at which the sky and Earth appear to meet
apparent horizon, horizon, sensible horizon, skyline, visible horizon
the range of interest or activity that can be anticipated
"It is beyond the horizon of present knowledge"
horizon, purview, view
a specific layer or stratum of soil or subsoil in a vertical cross section of land
horizon
is a part of
a vertical section of the Earth's crust showing the different horizons or layers
profile
is a type of (narrower)
one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
stratum
the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
celestial horizon, horizon