Bài hát: Listening Practice Through Dictation CD 1-09 - V.A

Unit 9 The Blue Sky
B : Joe asked me something about science just now.
But I didn’t know the answer.
G : I’m good at science. Ask me.
B : OK. Why is the sky blue?
G : I’ll explain it in a simple way. Light comes
through the air from the sun in waves.
B : The light is in many colors, right?
G : Right. Blue light waves are smaller than air
molecules. They sometimes get absorbed by
these molecules.
B : OK. What happens then?
G : Then the blue light waves scatter in many
directions. Your eyes see this blue light from
above you, after it leaves the air molecules.
B : So that is what makes the sky blue! What
happens to the other colors?
G : They reflect off the things that they hit. Your
shirt is red because our eyes see the red light
reflected from it.
B : Now I understand why the sky is blue!