In this section you will find a link to geocaching
In order to register an EARTHCACHE, you need to follow these steps:
Click: Play
Go to: hide and seek a cache - create a Geocache - already know your hiding spot? - continue -
Click the logo "earthcache"
An earthcache has to be a science lesson highlighting a unique feature .
Logging asks visitors to do a site-specific task which offers a learning opportunity.
It has to be submitted in the local language

Here's a link to earthcaching
Click on "getting started" and then "EarthCaching for teachers".