Question

PLEASE............PLEASE.............PLEASE HELPPPPP

what information does a ship's sonar device use to determine the distance to the ocean?
a. the speed of sound in water and the time it takes for a signal to return
b.the temperature of the water and the temperature of the air above it
c.the composition of the ocean floor and the temperature of water near the ocean floor
d.the composition of the ocean floor and the temperature of water near the ocean floor
( i know there are two of the same answers but um that's how it was so....)

Answer 1

the answer is a), it uses sound waves to bounce of the ocean floor and it calculates the time it takes for the waves to come back up. They then can figure out the depth by using this

Answer 2

C would be the answer to that