Question

What is the Moho and where is it located? How do we know this?

Answer 1

Hmm, Here is what wikipedia says, The Mohorovičić discontinuity, the boundary between the Earth's crust and the mantle, often known simply as the Moho
The town of Moho, Peru in the Puno Region of Peru
The Moho Province in the Puno Region of Peru

Answer 2

Rings a bell?

Answer 3

And I thought this question was some joker fooling around.