The ocean floor is mapped by sending sound waves downward and measuring the time it takes for their echo to return. if a ship sends out sonar pulses and records their echo 3.27 s later, how deep is the ocean floor at that point? assume that the speed of sound in sea water is 1530 m/s. a. 1800 b. 3600 c. 5000 d. 2500

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.