I'm the author of the ASHFALL three-and-a-half-ology: ASHFALL, ASHEN WINTER, SUNRISE, and DARLA'S STORY.
I will visit Chichen Itza a couple weeks from now! I'm really looking forward to the trip. This book is a decent basic introduction for children, but it over-simplifies its subject matter. I wish the author and/or editor had put more trust in their audience. Kids who are interested in a topic will put far more effort into decoding complex ideas and texts than some people give them credit for.