Great Simulation Game that teaches kids about Natural Disasters is a great website for your students to learn about various natural disasters such as tsunamis, bush fires, earthquakes and more by managing a village or city through a disaster period.  Anyone who has played SimCity will pick this up in a flash and discover the purpose of the game with ease.  Quite simply you are given a budget and limited time to create natural and manmade infrastructure to both prevent a an imminent catastrophe and manage it once it occurs.  Your kids will really enjoy this challenge and it has loads of replay value in it across a range of disasters.  Check it out here.