![HowtheGrandCanyon(大峡谷)wascreatedremainsoneofthegeology’...]( "HowtheGrandCanyon(大峡谷)wascreatedremainsoneofthegeology’...")
- 问题详情：HowtheGrandCanyon(大峡谷)wascreatedremainsoneofthegeology’sgreatestmysteries.SomeevidencesuggeststhattheprocesswasagradualoneinwhichtheColoradoRiver(whichrunsthroughthecanyon)slowlycutdeeperanddeeperintothegroundovermillionsofyears.Butvolcan...
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