Your homeschool science curriculum requirement can be satisfied with the Christian Liberty Nature Reader series. Simply supplement these with a few additional books from the library to create an entire program.
The small, softcover books, covering grades kindergarten through five, have great nature stories that most children will enjoy. Each book is age-appropriate so that a student can read their grade level reader with little help from the parent.
They also provide answer keys that give further study and answers to the comprehension questions found in the student text.
Oftentimes this reading series is omitted from many mainstream home school book reviews but it certainly can be used as a complete curriculum. These books can form the basic framework of a homeschool science curriculum and you could add enrichment studies, as needed.
A few ideas include…
As long as the specific homeschooling requirements for your state are met, then this can be an option especially in the early grades.
If you want an inexpensive, Christian, home school program then take a look at these nature readers which have many great, wholesome stories from a Creationist viewpoint.