How can headphones block out sound?

WALT identify one type of insulation and understand its 

functions.

I know this when I write 4 facts about Headphones

Can you keep it down?

  

                            WALT identify ways to minimise bad sounds.

                  I know this when I write 8 solutions to reduce unwanted noise.  

Do I hear something?

Created with Padlet

WALT understand sound by creating a brainstorm using padlet.