I was disappointed when my first earthcache submission was quickly denied because it wasn't primarily geology-oriented. Looking at the guidelines at earthcache.org, the first guideline is EarthCaches must provide an earth science lesson. Unfortunately, the (earth science defined) link next to that guideline takes you to a list of five bullets, all of which list geology as their primary requirement.
I grew up where the definition of Earth Science matched what Wikipedia (https://en.wikipedia.org/wiki/Earth_science) lists as the fields of science that comprise Earth Science
Geography
Geology
Geophysics
Soil science
Ecology
Hydrology
Atmospheric sciences
I understand the need to tie the earthcache to a physical location, which makes Geophysics and Atmospheric Sciences difficult. I also understand not including Natural Sciences (like Biology, Zoology, etc.), but only including Geology seems shortsighted.
My specific cache dealt with a new Rain Garden installed in a local park overlooking the Geneesee River. The write-up focused primarily on the Ecology benefits of using the environment to collect and filter water to reduce sediment and contaminants from entering the local waterways. It also can help reduce effects of erosion. I think this is a great example of an Earth Science lesson and would benefit from people visiting and understanding the environmental impact of the area. It's definitely not much of a Geology lesson though, so it doesn't look like it will become an earthcache.
I think that the rigid interpretation of Earth Science as "only Geology" should change to allow for caches like this one to be published.