Which statement is true about voice?
a. voice uses a wider range of pitch and volume as compared to speaking.
b. the greater the tension on the vocal chords, the lower the pitch.
c. women can produce a lower range of pitches as compared to men.
d. african singers sit on the floor while singing.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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