I enjoyed this site particulary for it's games and activities for students. I have found many that AI can use in the classroom teaching earth science. Our students enjoyed creating their own ocean and making their own asteroids. These activities allow for student participation which helps the English learners relate to the areas of science that are difficult to teach in expository texts.
The only problem a teacher may face with the "Making Asteroid" activities is having a place to bake the asteroids. Our school has a full size kitchen which allows us to utilize the ovens. Another solution would be to utilize the "Sun Pizza oven" offered on this site to create an oven for the asteroids. This activity would need to be done during hot climate times in order to bake the asteroids.