EasyScience
Lots of people have heard it, but no one has seen it. It will not speak back unless spoken to.
Riddle
Lots of people have heard it, but no one has seen it. It will not speak back unless spoken to.
Choose an answer
A.A ghost
B.The wind
C.A radio
D.An echo
Hint: It's a 2-word phrase with 6 letters, starting with "A".
Answer
An echo
Why this is the answer
An echo is a reflection of sound that returns to the source after a delay.
This riddle is filed under Science Riddles and rated Easy.