Huh. Apparently, chalk is a bunch of tiny little soccer balls ... if soccer balls were made out of dead bodies, that is.
Yes, those yarmulke-looking things are actually the shells of dead microscopic organisms like foraminifera mixed with the corpses of sea algae. So the next time you see a chalk outline of a murder victim, just know that it was created with the help of about a billion teeny-weeny corpses. It's pretty much the ultimate counter to that circle-of-life crap that Disney likes to shove down our throats.