Voyage to the Deep
Science

An instrument used to measure the conductivity, temperature and pressure of seawater
CTD device
An instrument used to measure the conductivity, temperature and pressure of seawater. CTD device. A CTD device is a tool scientists use to study seawater by measuring its saltiness, heat, and depth pressure.

A part of the large-scale ocean circulation that is driven by global density gradients
Thermohaline circulation
A part of the large-scale ocean circulation that is driven by global density gradients. Thermohaline circulation. It is the movement of ocean water caused by differences in temperature and salt levels, which helps regulate Earth's climate.