Erayga "A horizon" waxaa caadi ahaan loo adeegsadaa cilmiga ciidda waxaana loola jeedaa lakabka ugu sarreeya ee ciidda, oo sidoo kale loo yaqaanno ciidda sare. Lakabkani caadi ahaan midabkiisu wuu ka madow yahay lakabyada hoose taas oo ay ugu wacan tahay ururinta maadada organic iyo macdanta ee cimiladu ka soo degtay oo laga burburiyay dhagaxaan muddo ka dib. Caadiyan waa lakabka ugu bacrinsan carrada, oo leh maaddo nafaqo sare leh iyo heer sare oo dhaqdhaqaaq bayooloji ah. Erayga "A horizon" wuxuu ka yimid ereyga Jarmalka "Auflagehorizont," oo macneheedu yahay "horizon lakabka sare."