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.

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《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.

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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.

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