Ans is <span>A.musical note
the others are beyond audible range of human ear
</span>
Crust, Mantle, Outer core, Inner Core
D. For plato users
(I've had the exact same one)
Answer:
about 93 billion light years
Explanation:
The observable Universe is, of course, much larger. According to current thinking it is about 93 billion light years in diameter.