Which of the following statements is true?

The Decca navigation system is used today by the U.S. Coast Guard.

SONAR was developed during World War I to track the location of underwater mines.

Seismic profiling uses high frequency radio waves to map the surface of the ocean floor.

All of the above.

None of the above.

Question

Which of the following statements is true?

The Decca navigation system is used today by the U.S. Coast Guard.

SONAR was developed during World War I to track the location of underwater mines.

Seismic profiling uses high frequency radio waves to map the surface of the ocean floor.

All of the above.

None of the above.

king.void. · Answer

Welcome to openstudy!! 
Wrong section ;) please close this and post it in the correct section.
Thanks!
Void!~

jigglypuff314 · Answer

@zbrownie_brown http://openstudy.com/study#/groups/history

msambergrace · Answer

206.6?