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.
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 .
What theory was more widely accepted by the mid-20th century?
What theory was more widely accepted by the mid-20th century ?
the theory of plate tectonics
the theory of plate tectonics