Important geological concepts were established as naturalists began studying the rock formations of the Alps in the 18th century. In the mid-19th century the now defunct theory of geosynclines was used to explain the presence of "folded" mountain chains but by the mid-20th century the theory of plate tectonics became widely accepted. COUNT 4
QSN1 Who began studying the rock formations of the Alps ANS1 naturalists QSN2 When did the studying of rock formations begin in the Alps? ANS2 the 18th century QSN3 What was used in the mid-19th century to explain the presence of "folded" mountain chains?  ANS3 theory of geosynclines QSN4 What theory was more widely accepted by the mid-20th century?  ANS4 the theory of plate tectonics