人类对地球的自觉研究,少说也有上千年的历史,但地球上海陆的起源,仍然是个谜。以往关于大陆形成的一种普遍说法是:地球物质分异产生了陆壳。本世纪初诞生的大陆漂移说,以及近十几年兴起的板块学说,也未能说明大陆最初是怎样形成的。而这个问题不但与地球的起源、演化历史有着极为密切的关系,同时也是研究地壳运动不可回避的基本问题。因而至今吸引着许多地球科学工作者,从不同角度去进行顽强、大胆的探索。据几位美国学者最近报导,北美大陆的诞生,很可能与一个巨大的流星体有关,其直径大概有96.5 Human beings consciously study the earth, say less, for thousands of years. However, the origin of land on earth is still a mystery. A general statement about the formation of the continent in the past is that the continental crust created the continental crust. The mainland drift born at the beginning of this century, as well as the plate theory that emerged in the past decade or so, have failed to show how the mainland was originally formed. However, this issue is not only closely related to the origin and evolution history of the earth, but also the basic issue of studying the unavoidable crustal movement. So far, many earth scientists are attracted to conduct tenacious and bold exploration from different angles. According to several American scholars recently reported that the birth of the North American continent is likely to be related to a huge meteoroid with a diameter of about 96.5