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horizon-the line at which the sky and Earth appear to meet. apparent horizon, sensible horizon, visible horizon, skyline. linear perspective, perspective-the appearance of things relative to one another as determined by their distance from the viewer.
Hidden Horizons. Below the line at which the land appears to meet the sky, there are other horizons. These âhiddenâ horizons are the descending layers within a soil. Horizons are the visible evidence of soil-forming factors at workâclimate, organisms, relief (topography), parent materials, and time. Scientists group soils based on the arrangement and properties of horizons.