What is a book that goes into reasonable detail (but isn't textbook-level technical) about the origin of earth and in particular the origin of life on earth? Something intended for a broad audience, but that still covers the biology/geology and does not completely gloss over the sicence.
I would recommend The selfish gene by Richard Dawkins. It is targeted at a scientifically interested audience, but well written and recognized by the scientific community.
I think this book (The Story of Life, Southwood) would be just what you are looking for - it was one of my modules during my undergrad in Evolution and I think it touches on the basic geology too. It is quite an easy ready but covers the material pretty well, it also has good reviews on Amazon etc.
This book by Steven Rose is supposed to be an update of the original for a modern audience: