I speak without a mouth and hear without ears. I have no body, but I come alive with wind. What am I?

An echo!

Did You Know?

The riddle describes something that "speaks" and "hears" but has no body until wind brings it alive — that's an echo! Echoes occur when sound waves bounce off surfaces and return to your ears. The longest echo ever recorded lasted 75 seconds, bouncing around inside an underground oil storage facility in Scotland.