This is a 1975 work that I read a long time ago and have just now read a second time.
Motz does a very good job providing clear answers to some basic questions. I thought he delved a little too deeply into the various types and classifications of stars, and I have seen this trend in other books like this as well, but this does not detract from the quality of the book.
His description of the evolution of earth's atmosphere is enlightening as is his clear description of how it, the earth, "handles" CO2 through a complex but understandable interaction between plants, animals, the oceans, and minerals. This last portion is especially relevant today.
On a couple points of cosmology, Motz is, understandably, outdated. But, overall, he has done a good job creating a readable and informative book.