Multiple choice

How much of the ocean floor have humans mapped with modern sonar technology?

  1. Less than 20 percent

  2. About 30 percent

  3. About 40 percent

  4. About 60 percent
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Despite modern advancements, less than 20 percent of the ocean floor has been mapped with high-resolution sonar technology. The remainder is mapped primarily using satellite altimetry, which provides much lower resolution.

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