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8.what is the main reason why you can hear noises a long distance away over water at night

a.there are fewer other noises at night

b.water conducts sound better at night

c.sound bounces off water better at night

d.sound waves are bent towards the cool air over the water


9.sound waves cannot travel in

a.air b.water c.steel d.vacuum

10.when light travel from air to grass its speed

a.increases b.remains the same c.decreases d.increases then decreases