horizon

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horizon
  • noun
    The line at which the earth's surface and the sky appear to meet. (the sun rose above the horizon)
    The limit of a person's mental perception, experience, or interest. (she wanted to leave home and broaden her horizons)
    A layer of soil or rock, or a set of strata, with particular characteristics. (Throughflow occurs when there are significant changes in the density of different layers within the soil horizon.)

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