As a general rule, I like this series of books.  This one did have a lot of good solid information, clearly explained, but I found it’s definition of minerals somewhat unclear/contradictory: in one place it defines minerals as inorganic substances found in the earth, which are not alive and “do not come from plants or animals.” Yet elsewhere in the book it states that many foods contain minerals, including fruits and vegetables, eggs and dairy products.  No where does it offer an explanation for this contradiction.  I’m afraid students will find it confusing.