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.

None of the above.

Explanation:

The Decca system was discontinued in 2001. Loran-C replaced the Decca navigation system which was more accurate. Loran-C uses low frequency radio waves.

SONAR (sound navigation ranging) was developed in World War I for threats like submarines.

Seismic profiling uses frequencies lower than 3 to 30 Hz which is not considered as high frequency.

none of the above

Explanation:

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation:

the answer is d the rejection of the olive branch petition.

explanation:

the olive branch petition was an attempt to state the rights of the colonists while keeping their loyalty to the british crown. hope this !

by kd