内容简介
Therearecanyonsallovertheplanet,andtheGrandCanyoninArizonaisnotthebiggest.Yetbecauseofthespectacularcolorsintherocklayersandfascinatingformationsofboulders,buttes,andmesas,itisknownasoneoftheSevenNaturalWondersoftheWorld.Startingwithabriefoverviewofhownationalparkscameintobeing,thisbookcoversallaspectsofthecanyon--howitformed,whichearlynativepeoplelivedthere,andwhatvariedwildlifecanbefoundtherenow.Ahistoryofthecanyon'send-to-endexplorationinthelate1860sandhowtheGrandCanyonbecamesuchapopularvacationspot(5milliontouristsvisiteveryyear)roundoutthisinformative,easy-to-readaccount.