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The ocean is, on the average, nearly three miles deep. The continents barely stick out above sea level. The rocks that make up the continents are lighter than t

The ocean is, on the average, about three miles deep. In comparison, the continents barely stick out above sea level. The rocks that make up the continents are

The ocean is, on the average, nearly three miles deep. The continents barely stick out above sea level. The rocks that make up the continents are lighter than t

This book compares knowledge of prehistoric things from two dissimilar sources. It presents knowledge in chronological order and shows the remarkable similarity

In 1915 Alfred Wegener's seminal work describing the continental drift was first published in German. Wegener explained various phenomena of historical geology,