In the mid-twentieth century, oceanographers used what devices to ...

[beccaep]

In the mid-twentieth century, oceanographers used what devices to map the ocean floor?
  a. Seismographs
  b. Convective current profilers
  c. Isostatic sounders
  d. Conductive detectors
  e. Echo sounders

Question 2

Oceanographers and seismologists further explored the theory of continental drift during the early- to mid-twentieth
  century by correlating patterns of earthquakes and ____.
  a. volcanoes
  b. fault lines
  c. isostatic equilibrium
  d. tectonic plates
  e. convection currents

[aprice35067]

Answer to Question 1

e

Answer to Question 2

a