The most useful way to measure seafloor depth is to ____. ...

[stock]

The most useful way to measure seafloor depth is to ____.
 A)measure the time it takes for sound waves to travel from a ship to the seafloor and back
 B)use an energy source to produce strong waves that will reflect from the seafloor and layers beneath the seafloor
 C)use a very long line with a weight attached
 D)make trips to the seafloor in modern submersibles
 E)extrapolate depth from temperature and pressure changes

Question 2

Regional metamorphism is confined to convergent plate margins.
  Indicate whether the statement is true or false

[parker125]

Answer to Question 1

B

Answer to Question 2

False