Just finished The Inheritance Cycle

[gastonscave]

My DS has just finished the fourth and last book in this series. He has throughly enjoyed them but is now at a loss what to read next.

He is eleven and usually reads non fiction. These are the first fiction that have sparked his interest in literature and I would like to build on this. His main interests are science and nature

Any suggestions? He started reading the Golden Compass and was really enthused for the first few chapters but he says he has lost interest in it now

He could try the first book in the Wheel of Time series: here on Amazon. It has the same sort of theme to it but it is a long, long series (last book due to be published next January).

The Hobbit and The Lord of the Rings might be good ones too.

DD is a bit younger (10) but also Eragon obsessed. She also likes:

Temeraire + sequels by Naomi Novik
Anne McCaffrey's Dragonsinger trilogy
A Wizard of Earthsea

Temeraire is aimed at adults but I'd definitely recommend it - its an alternate history set in the Napoleonic wars but with added dragons - weird but cool. (Personally I think the sequels are rather weak and she lost the plot a bit after the first book, but dd has enjoyed them.)

Thank you for your suggestions. We will head to the bookshop tomorrow

If he likes wild animals, there's a series by Willard Price that are great. The first is Amazon Adventure, then South Sea Adventure and so on. There are thirteen or fourteen of them altogether. They're a bit dated now, but all the animal info and facts in them are correct, and I've found that stuff I read in them over 30 years ago still sticks in my head today and has come in handy.
They aren't at all modern or "hi tech" but they are exciting stories and set all over the world.
For sci-fi you could try the Heinlein juvenile novels, Space Cadet, Have Space Suit, Will Travel, Podkayne of Mars, Between Planets to name but a few.