This link goes to a document that I have created that walks students through using several different websites to review Earth Science.
It is specifically geared towards reviewing in the computer lab for Regents Earth Science (New York State), but could definitely be used in other Earth Science classes.
I like to use this on a fairly early day in the 'review' section of the course. It then allows students a chance to get familiar with the websites in a guided setting, and then take the directions home to study on their own, or earn extra credit (obviously the teacher's choice). Students seem to like it because it allows them some control, and they can work at their own pace.
This could also be a great option for kids to use when they have extra time in library, tech, or other classes where they have computer access.
Hope it is helpful!