Silver Burdett Science Grade Two Student Text by G. Mallinson, et al
I received several copies of this book from a public school which had stamped them "obsolete". I thought it was a great find -- free textbooks! I soon realized that not only was this book too dumbed down for my 1st grader (I homeschool), it was too dumbed down for my 4 year old.
For instance, I just flipped the book open and find, "You can see shapes. You can feel shapes. You can use shapes. Shapes help you learn. What shapes do you see in the picture?" That is an entire page of this "textbook" -- the entire book is written at that level.
It might be a really good tool to use with a 3 year old. It is not something I would ever insult a 2nd grader with. I cannot stretch my imagination to the extent of understanding how any teacher of 7 year old children could find this book useful at all.
My advice is to skip this one, unless you're looking for a really good reason to doubt the sense of textbook publishers and public schools.