The Lion of Mars, Jennifer L Holm
Bell is just like any other kid. He loves cats, cake, and asking questions. There's just one thing: He lives on Mars. And life on Mars is very different. Four one, the food is all made of algae! (So is the toilet paper.) When a virus breaks out in the settlement and the grown-ups get sick, Bell and the other kids are suddenly on their own. It's up to Bell to brave the unknown--to save not only his family but all of Mars. Maybe Bell isn't just like any other kid after all...
0.8" H x 7.5" L x 5.1" W, 288 pages, paperback