Visitors from Outer Space - Paperback

by Mari Bolte (Author)

The odds of us being alone in outer space are small. Maybe we've already been visited by alien life but didn't even know it. What if those life forms are still here? Jump into some of Earth's most alien mysteries and explore the signs they may have left behind. Includes 21st Century Skills and Content, sidebars, activity, table of contents, index, and glossary.