I Have, Who Has... is a team based game that gets every student involved in review. To make this as successful as possible, I recommend timing the students so they can set a personal best as a class and attempt to beat other classes times.
This particular set covers Earth's layers, and Sun, Earth, and Moon systems. The vocabulary is aligned to NC Essential Standards for Science: 6.E.1; 6.E.2. The complete list of vocabulary and definitions used for the year can be purchased from my store!
Just print the cards, cut them out and you are ready to go. Print another copy for teacher to follow along. The answer path is straight down the left side then straight down the right side for each page.