指数倍快速增长的国际互联网 ,对发展能够在WWW万维网上找到有用信息的工具提出了新的要求 ,“模拟图书馆 (VirtualLibraries)”和“搜索器 (SearchEngines)”就是两种已有的工具 ,可被用于搜寻地球科学信息资料。由于各种数据库中的信息在质与量上有很大的差异 ,为了收集到与某一特定题目有关的大量信息 ,就得采用有效的互联网搜索技术。此外 ,对所收集的信息的质量必须进行严格的评估 The rapidly expanding Index of World Extensions poses new requirements for developing tools that can find useful information on the WWW World Wide Web. “Virtual Libraries” and “Search Engines” are two existing tools, Can be used to search geoscience information. Due to the large differences in the quality and quantity of the information in various databases, effective internet search techniques have to be employed in order to gather a wealth of information about a particular topic. In addition, the quality of the information collected must be rigorously assessed