Multiple choice

The unit used to measure the depth of seas is

  1. kilometer

  2. fathom

  3. light year

  4. parsec

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fathom is a nautical unit of depth equal to 6 feet (about 1.83 meters). It has been used for centuries to measure water depth for navigation and anchoring. Light years and parsecs measure astronomical distances, while kilometers are metric units.