The best replacement for geology is geography.

The best alternatives to geology are rated as following:
★★★★★  geography
★★★★  biology
★★★★  geophysics
★★★  environmental science
★★  chemistry
★★  earth science
★  astronomy
★  geological engineering
★  petroleum engineering
★  biology easier
★  physics
★  geoscience
  historical geology
  astronomy easier
  ecology
  civil engineering
  physical geology
  oceanography
  geography easier
  environmental engineering
  genesis
  introductory geology

Your alternative for geology is not listed? Suggest!
Speaking about geology, one probably shouldn't forget about geophysics.

Other search terms related to geology and their ratings are:
★★★★★ geophysics
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Google Trends

Scale is based on the average worldwide traffic of geology in all years. Click on graph for more.
geology
geography
biology