We looked into Earth Adventure but found that The earth Dome from Mobile Ed Productions was the same thing but for less money. They are also national, I believe. I know my kids loved that show! We have used them a lot for other things , too. They have a lot of shows and all the ones we had were good. We really liked Young Authors Day.
I would highly recommend Earth Adventure. They are a non-profit from the Minneapolis area but I believe they are a national company. Their school assemblies are great - interactive, exciting, engaging, and very informative. I will paste a description of their programs along with their web address:
"Earth Adventure will visit your school to provide interactive science and geography-based programs. Our grade-level appropriate programs complement K-12 curriculum and reinforce education standards. One of our qualified teachers will travel to your school to bring the program to your site. We work with individual classes of 30 students and can accommodate up to 12 classes per day. The program features the Earth Balloon, a 20' diameter model of the earth. Students enter the Earth Balloon to learn about our precious and diverse planet. Explore the earth with us!"