![HowtheGrandCanyon(大峽谷)wascreatedremainsoneofthegeology’...]( "HowtheGrandCanyon(大峽谷)wascreatedremainsoneofthegeology’...")
- 問題詳情：HowtheGrandCanyon(大峽谷)wascreatedremainsoneofthegeology’sgreatestmysteries.SomeevidencesuggeststhattheprocesswasagradualoneinwhichtheColoradoRiver(whichrunsthroughthecanyon)slowlycutdeeperanddeeperintothegroundovermillionsofyears.Butvolcan...
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