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Life in a river
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Life in a river

著者: Valerie Rapp
出版商: Minneapolis : Lerner Publications Co., ©2003.
丛书: Ecosystems in action.
版本/格式:   图书 : 小学和初中 : 英语查看所有的版本和格式
提要:
Go on a journey that begins in small mountain streams and passes through large rivers to the ocean. Using the Columbia River Basin as an example, Life in a River examines the physical features, processes, and many different species of plants and animals that make up a unique river ecosystem. Find out about the impact of humans on this once-pristine ecosystem and what is being done to save it. Follow the river on its  再读一些...
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类型/形式: Juvenile literature
材料类型: 小学和初中
文件类型:
所有的著者/提供者: Valerie Rapp
ISBN: 0822521369 9780822521365
OCLC号码: 46590038
描述: 72 p. : ill. (some col.), col. maps ; 26 cm.
内容: What is an ecosystem? --
Columbia River ecosystem; a natural history --
In the mountains; streams --
Coming out of the mountains; medium-sized rivers --
In the valleys; large rivers --
Wild salmon; a keystone species --
People and the Columbia River basin --
What you can do.
丛书名: Ecosystems in action.
责任: Valerie Rapp.

摘要:

Go on a journey that begins in small mountain streams and passes through large rivers to the ocean. Using the Columbia River Basin as an example, Life in a River examines the physical features, processes, and many different species of plants and animals that make up a unique river ecosystem. Find out about the impact of humans on this once-pristine ecosystem and what is being done to save it. Follow the river on its amazing journey and learn what makes it so special.

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