RunCraigRun

I've placed 25 traditional caches and was looking to try to expand my horizons with an earthcache. I identified a location and topic that I thought would be a great educational experience. Then I read the guidelines and learnt that earthcaches are limited to geology. I can't find the rationale for that, and I'm curious why that is. My topic was ecological so it wouldn't be accepted. Any insight to share? Thank you.