Olympus Mons is the solar system's largest volcano. It is located on the planet Mars. So of course the project for this week was building and erupting a volcano.
Unfortunately, I do not have a picture of it painted and erupting. But let me tell you, if your kids are bored, take them outside and let them play with baking soda and vinegar (or diet coke and mentos). The boys and girls from 3 to 12 were immensely entertained by playing in the dirt and erupting volcanoes.