You can use this Google Operator to find any powerpoint files on any topic. [2018]

It happened to me once at university. I had to make a presentation within 5 minutes, I used Google and it went well. LOL!

Your Topic filename:ppt

*You can use pptx too.

Example in Screenshot: https://www.google.com/search?q=Water+Pollution+filetype%3Appt&oq=water+pollution+filetype%3Appt&aqs=chrome.0.69i59l2.3002j0j9&sourceid=chrome&ie=UTF-8

You can also use other operators:

1. Word file with filename:docx
2. PDF with filename:PDF
3. torrent with filetype:torrent

Cheer! :)