《地质学》和《地球科学评论》上的一项研究表明古代的河流是笔直宽阔的水面。
Studies in the journals Geology and Earth-Science Reviews reveal that ancient rivers were broad straight sheets of water.
有些大学开设了地球科学专业，但多数大学开设的是分得更细的专业，比如地质学、气象学、海洋学和天文学。
Some universities have Earth Science programs but most offer more specific training in programs such as geology, meteorology, oceanography or astronomy.
典型的古代的河流只是宽阔的、像平板一样的水流。 《地质学》和《地球科学评论》上的一项最新研究说我们应该感谢最初的那些陆生植物，它们使河流变得弯曲了。
They say that well before dinosaurs or, really, much of anything roamed the Earth, rivers were just vast expanses of water heeding only gravity and heading straight to sea.
收藏地球科学、地质学、矿物和珠宝。
收藏地球科学、地质学、矿物和珠宝。
地质和地球物理这两个地球科学分支的差别并不泾渭分明。
The distinction between geophysical and geological branches of earth science is not clear - cut.
地质和地球物理这两个地球科学分支的差别并不泾渭分明。
The distinction between geophysical and geological branches of earth science is not clear-cut.
地质和地球物理这两个地球科学分支的差别并不泾渭分明。
The distinction between geophysical and geological branches of earth science is not clear-cut.
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