So, we’ve been using the Book Series Christian Kids Explore for over 9 years in our local homeschool cooperative. We do the 4 books in the cycle 🙂
Well ~ the deal is, the content is easy to use for a big family.
It covers multigrades and you can expand it! If you have littles, add some fun readers in the same topics 🙂 The Biology is probably the easiest, so if you have the younger ages – (grades 2-6) start there! The Physics is the hardest, think my edition is labeled grades 4-8. You can really easily help kiddos on either end get a great exposure!
It is awesome hands on 🙂 (this is the inner core, outer core, mantles and crust!)
If you love homeschooling and hands on application of Science, consider this great series!