速解“美国科罗拉多大峡谷岩石的主要类型是啥?和大峡谷的形成过程?”

C

本题考查旅游资源的特征。人文景观具有可创造性，故选C项。

可以表现出雅鲁藏布大峡谷的高

B

科罗拉多大峡谷是一处举世闻名的自然奇观,位于美国西部亚利桑那州西北部的凯巴布高原上,大峡谷全长446公里,平均宽度16公里,最大深度1740米,平均谷深1600米,总面积2724平方公里.

科罗拉多大峡谷 Grand Canyon
维多利亚大瀑布 Victoria Falls
阿拉斯加冰河湾 Glacier Bay
猛玛洞 Mammoth Cave
珠穆朗玛峰 Mount Everest
贝加尔湖Lake Baykal
黄石公园 Yellowstone National Park

解题思路：由于这条河流将生活在美国科罗拉多大峡谷的Abert松鼠分隔成两个种群，由于地理隔离，它们之间不能进行基因交流，通过自然选择，生活在峡谷北侧的种群在形态和体色等方面都发生了明显变化，人们叫它Kaibab松鼠，但它们之间不一定存在生殖隔离，如果能杂交且产生可育后代则仍为同一物种．

A、峡谷南、北两侧的自然环境不同，则对Abert松鼠两个种群的选择方向不同，A正确；
B、河流的分隔导致地理隔离，使峡谷南、北两侧的Abert松鼠间没有基因交流，B正确；
C、只能判断Kailab松鼠与峡谷南侧Abert松鼠间存在地理隔离，不能判断出现生殖隔离，C错误；
D、由于南、北两侧的自然环境不同，则选择方向不同，进而使两个种群的基因库出现差异，D正确．
故选：C．

点评：
本题考点： 物种的概念与形成．

考点点评： 解答本题的关键是掌握物种形成与地理隔离和生殖隔离的关系．

　　Serengeti Migration
　　Over a million animals annually trek the circular Serengeti Migration route in search of water and pasturage.Safari-goers see wild lions,giraffes,zebras,wildebeests,elephants,and more.
　　Galapagos Islands
　　The islands' isolation allowed the creatures on the Galapagos Islands to evolve differently than their distant ancestors on the South American continent.Charles Darwin made the Galapagos famous.
　　Grand Canyon
　　The Grand Canyon took over a billion years to develop.Its depth,width and magnificent views exceed the expectations of most visitors.
　　Iguazu Falls
　　The water plummets over a wide set of rims that are as high as a 24 story building.Iguazu Falls is far more spectacular than Niagara Falls,but only slightly more so than Victoria Falls (which ranks #8 among the world's natural wonders).
　　Amazon Rain Forest
　　The Amazon Rain Forest is immense (spans most of South America's width).It has a jungle dense with unique vegetation - and a snaking rive
　　Ngorongoro Crater
　　Many major safari animals are "trapped" on a vast round plain surrounded by the high walls of a collapsed ancient volcano.The Ngorongoro Crater is a vivid experience for adventure travelers.
　　Great Barrier Reef
　　This tropical archipelago is situated off the continent's northeast coast.The Great Barrier Reef is passionately praised by divers,snorkelers,and glass bottom boaters for its coral fish and reef viewing.
　　Victoria Falls
　　Victoria Falls is almost as breathtaking as Iguazu Falls,which is ranked just four notches higher on my natural wonders list.
　　Bora Bora
　　Bora Bora has been called the world's most beautiful island because of its soaring volcano core encircled by a blue lagoon ringed by a coral reef.
　　Cappadocia
　　In Cappadocia's tall,bizarre shaped rock formations were created by nature.A thousand years ago the local inhabitants carved caves into some of them for use as dwellings.

雅鲁藏布大峡谷平均深度在5000米以上,最深的地方为5382米秘鲁科尔多峡谷平均深度3200米左右 所以 前者比后者平均深度超出了1800以上 雅鲁藏布大峡谷深度5000