Question

select the correct answer.
sonar stands for \sound navigation and ranging.\ what assumption was proved wrong after the invention of sonar?

a. the age of the ocean floor is variable.

b. the ocean floor is featureless.

c. the ocean floor is changing.

d. the ocean floor is denser than continental crust.

Explanation:

Sonar (sound navigation and ranging) enabled detailed mapping of the ocean floor. Before sonar, it was assumed the ocean floor was flat/featureless. Sonar revealed features like trenches, ridges, etc., proving this assumption wrong. Option A: Age variability wasn't disproven by sonar. Option C: Ocean floor changing is a known concept, not disproven by sonar. Option D: Density comparison wasn't disproven by sonar. So the correct answer is B.

Answer:

B. The ocean floor is featureless.