Pinnas on maakoore pindmise kihi moodustavad setendid ja kivimid koos neile moodustunud mulla ja kultuurkihiga.
Pinnasest rääkides peetakse sageli silmas selle viljakandvust, viljeldavust, seetõttu mõeldakse pinnase all üldkeeles tavaliselt mulda[viide?].
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