Would he be up for Holling Clancy Holling's books: Paddle to the Sea, Pagoo, Minn of the Mississippi,The Tree in the Trail or Seabird? They are all wonderful; we've been reading them over the last year (my son is five, but I think they actually would work really well for 7-10 year old kids.
The books were written at various times between 1941-57 and they have a rich illustrations, great details and both a sense of history, geography and so much more. I found myself most enjoying "Pagoo" (the story of a "pagurus" or hermit crab-- which starts with the tiny crab emerging from it's egg into an ocean of diatoms and zooplankton and documents in great fun detail the story of his maturity and the adventures of living in the tidepool). "Paddle-to-the-Sea" is another fun one, and likely his most well known (an Indian-carved "Indian in a canoe' starts off in the forests of Canada and takes a journey through the great lakes, and then onward to the Atlantic.
My five year old was able to listen to both of these books for about 30 min.+ at a time.
Another favorite is "Life Story" by Virginia Lee Burton ("Mike Mulligan and His Steam Shovel" or "The Little House"). This is the story of life on earth, from the beginning to present times. Another big favorite.
Happy reading!