EROSION THEORY
\ɪɹˈə͡ʊʒən θˈi͡əɹi], \ɪɹˈəʊʒən θˈiəɹi], \ɪ_ɹ_ˈəʊ_ʒ_ə_n θ_ˈiə_ɹ_i]\
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In geol. the theory that valleys are due to the wearing influences of water and ice. chiefly in the form of glaciers, as opposed to the theory which regards them as the result of fissures in the earth's crust produced by strains during its upheaval.
By Daniel Lyons
