As I said in my email, here are some links to free online non-fiction resources. Once you have found a book that you would like to read, go back to the link in the email I sent you and add it to the list beside your name.
SORA (EMSB Virtual Library) - At the top, click on the "Explore" bar and type in "Young Adult Nonfiction" to find 73 titles. Most are "on shelf".
ABDO - Here is A selection of social studies ebooks listed at Grades 9-12 (I think the content will be too simple for your students + very American in focus, but perhaps they could read an entire series for a more global look at a topic)
National Emergency Library - The Internet Archive has suspended its wait lists for the 1.4 million books in its online lending library. It is a bit of a beast to search. They will need to search using keywords based on their interests - as there is too much to browse through, but there is a ton of content. Students will also need to create a quick account using their email addresses in order to borrow the books for 14 days. Let me know if you want me to help students walk through this.
University of Michigan Press has uploaded its entire book collection for free for the duration of COVID. There may be something here for your more ambitious readers, e.g.:
What Is Post-Punk?: Genre and Identity in Avant-Garde Popular Music
The Many Faces of Political Islam
Piecemeal Protest: Animal Rights in the Age of Nonprofits
A History of Disability
And there is always https://www.gutenberg.org/ for works in the public domain, if the students feel like tackling a classic such as "Beyond Good and Evil" by Nietzsche, Walden by Thoreau, or The Problems of Philosophy by Bertrand Russell, etc..
This might be a fun distraction for them, too, the Best Commencement Speeches (NPR): https://apps.npr.org/commencement/