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hat the birds instead used star patterns within about 35 degrees of the North star.Interestingly, there is little evidence that the moon plays a role in nighttime navigation by fact, the evidence seems to suggest that a birght moon actually interferes with stellar brings us to the topic of manmade light pollution that blots out the stars across much of North America, especially around highly populate areas. What actually is the impact of light pollution on bird migration and other flora and fauna, and on man himself? We will deal with this topic in a future posting. 第三篇 金星和地球的對比 講金星Venus和地球?qū)Ρ?,金星含較多CO2?! 〗馕觯罕疚膶偕飳W(xué)話題,考察動(dòng)物遷徙。Great PlainsThe northern and southern Great Plains are a broad expanse of flat land, much of it covered in prairie,steppe and grassland,which lies west of the Mississippi River and east of the Rocky Mountains in the United States and area covers parts of the . states of Colorado, Kansas, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, South Dakota, Texas, and Wyoming, and the Canadian provinces of Alberta, Manitoba and Saskatchewan.The Canadian portion of the Plains is known as the Prairies. Some geographers include some territory of Mexico in the plains, but many stop at the Rio Grande. The region is known for supporting extensive ranching and agriculture.GeologyThe Great Plains are the westernmost portion of the vast North American Interior Plains, which extend east to the Appalachian Platea