Capable of being worn away or gradually destroyed by erosion or abrasion.
From Latin 'erodibilis,' formed from 'erodere' plus '-ible,' meaning 'capable of being.' The term became common in English geological literature during the 19th century.
Not all rocks are created equal—limestone is highly erodible and forms caves, while granite is much tougher and resists erosion, which is why it's used in monuments.
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