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Role-playing and simulations are outstanding ways of getting students engaged in investigative learning, as well as being sure that the lesson takes into consideration the students' different learning styles (visual, auditory, kinesthetic, etc.)
In terms of whether or not a lesson like this would be appropriate for students in eighth grade:
I do similar activities with students in fourth, fifth, and sixth grade, and they have definitely learned a lot from such experiences. I have even integrated elements of STEM, particularly those of robotics, remote sensing, and practicing the scientific process, into these scenarios to make the lesson both more rigorous and more relevant to the types of tasks that would undertaken in the real world (see topic entitled "Solar System Exploration and Elementary-Level Robotics"). Given that these younger students could get so much out these lessons, I'm sure that your eighth-graders would be able to also.
Depending on what exactly you want your students to do, there are several different tools and sources of information that you can have them draw upon to use in various parts of the lesson.
Do you want them to find water on the moon (biology, use of instruments, engineering a new type of technology that can do the job)?
Do you want them to figure out how water can be brought to the moon (engineering, math involving weight, mass, fuel consumption, cost, etc.)?
Do you want them to figure out how to filter and reuse water (chemistry, engineering a filtration device, building a model)?
Are you going to have them do anything beyond just water?
Take a look at the attached lesson plans which were developed by NASA and see if there is anything that you might want to integrate into your unit. You may also want to check out the following:
http://science.howstuffworks.com/what-if-moon-colony.htm
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