How thick is the earth's crust?

Factual Questions
1

I know, I should be able to find this myself, but believe me, this is faster.

I’m just looking for a ballpark figure (though feel free to get all technical with each other, just because I don’t understand doesn’t mean it’s not fun to watch) for when, on average, you’d hit rock you’d start sinking into rather than standing on.

2

Anywhere between 10km and 70km, depending on where you measure at.

3

Ballpark figure followed by stuff I didn’t understand. Excellent. Thank you, Joe Random.

4

Here’s an image that is easier to understand, which I found buried in the site I linked.

http://mahi.ucsd.edu/Gabi/rem.dir/crust/crust2.dir/crust2a.thick.gif

My pleasure.