PLEASEPLEASEPLEASE HEL 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)

The consumption of fossil fuels could be

What is an aquifer for science class

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?