RP 33 Fleet Oceanographic and Acoustic Reference Manual Test 2025 – 400 Free Practice Questions to Pass the Exam

The correct choice indicates that there are 25,000 Gammas at the Poles and 65,000 Gammas at the Equator. This information reflects the variation in the Earth's gravitational field strength due to the shape of the Earth and its rotation. Specifically, the Earth's shape as an oblate spheroid leads to variations in gravitational force, which affects the measurement of gravitational acceleration.

At the Equator, the centrifugal force due to the Earth's rotation acts outward, resulting in a lower effective gravitational pull, whereas at the Poles, this centrifugal force is minimal. Therefore, the gravitational measurements (in Gammas) are generally higher at the Poles compared to the Equator. The distinction in these values helps in geological and oceanographic studies, providing insights into how the gravitational field affects ocean currents, tides, and other physical processes.

This difference is significant in oceanographic and environmental studies, as it can influence sea level measurements and subsurface characteristics.