Have you ever looked out an airplane window and wondered why some of the farms in the USA have circular crop patterns? Well if you have, then this is the book for you.
Window Seat
features dozens of aerial photographs of the US and Canada, sequenced by region.  Some highlight cities; others, the desert, mountains, or waterways.  Key features on each landscape are identified.  Then generally, two or three key points per area are explained in detail.
One of the cool things I learned in this book is that the Mississippi River's natural course to the Gulf of Mexico would actually end up 100 miles west of New Orleans.  It is only due to the continuous involvement of the US Army Corps of Engineers that the "good times roll" into New Orleans.  
Forewarned -- Gregory Dicum, the book's author, often explains this kind of human involvement in nature in negative terms -- unsustainable, or expensive, or polluting, or just plain wrong.  So, there are points in the book where you'll feel guilty about being aboard an airplane that burns a gallon of fuel every second, or turning on the water tap in a Las Vegas hotel.  Thankfully, he does not take the viewpoint that all human reengineering of mother nature is wrong, but certainly there are preachy moments.
As for the question about circular crop patterns -- in the west central US, you'll find this approach on farmland that is irrigated by well, rather than simply rainwater.  A water pump is in the center of the circle, distributing water through a long "arm" that circles around the farm plot.  Now we know. :)
If you don't mind the occasional attitude, the book is a fascinating explanation of the American landscape.  If you spend a lot of time flying across this continent and wondering what you are seeing below the airplane, as I do, this is a worthwhile read.

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