Blowing what into a whistle causes sound?
a lack of noise CFCs CO 2 a lack of sound wind air gas no noise
A B C D E F G H
Sounds are caused by vibrations in the air.
blowing air into a whistle causes sound
Blowing what into a whistle causes sound? (A) a lack of noise (B) CFCs (C) CO 2 (D) a lack of sound (E) wind (F) air (G) gas (H) no noise