EarthCalculus: Resources and Worksheets for Adventurous Instructors is available from Leanpub now! If you buy from Leanpub you get an automatic download of the complete worksheets and solutions pdf file: 136 pages of worksheets and solutions.
You can also get it from Amazon, but then be aware you've got to come back here and download the worksheets and solutions here! Note that you need a password: it's on page 3 of the pdf, at the end of the Introduction.
If you use this link, I get a slightly better portion of the payment 🙂