单词	planation
释义	planation /pləˈneɪʃ(ə)n / noun [mass noun] The levelling of a landscape by erosion.These profiles show evidence for planation at the top of the Outer Plains close to the Inner SDR.... Anglo-American geomorphologists tend to the view that pediments are the result of either lateral planation by ephemeral, migrating streams issuing from bordering mountains, or sheet-flood erosion. Indications of planation near the Inner SDR might either indicate that this unit formed partly under subaerial conditions (subaerial seafloor spreading) or that an uplift episode occurred after its emplacement. Origin Late 19th century: from plane1 + -ation.
随便看	offhanded offhandedly offhandedness offhandish offhandishly off-highway off-hours office office automation office-bearer office block office boy office building office copy officeful office girl office holder office hours office hymn office junior office lady officeless office man office manager office of arms

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