Continue reading the main story. Hundreds of pages of sworn testimony by Mr. Trump over the past decade show something less flattering. Some of his claims, made under oath, and under pressure, are shown to be hyperbolic overstatements, and others to be shadings of the truth or even outright misstatements. And in rare instances, he turns boorish and demeaning.
There are two types of sonarâactive and passive. Sonar, short for Sound Navigation and Ranging, is helpful for exploring and mapping the ocean because sound waves travel farther in the water than do radar and light waves. NOAA scientists primarily use sonar to develop nautical charts, locate underwater hazards to navigation, search for and map objects on the sea floor such as shipwrecks, and map the sea floor itself.
An oceanographer is a trained scientist who studies the various physical properties and processes of oceans.He or she might study the chemical composition of ocean water samples or investigate physical changes in tides and currents.n oceanographer may study changes in ocean tides and currents. Chemical oceanographers will specialize in studying sediments and marine plants. Despite the best efforts of oceanographers, there is little knowledge about the earth's ocean floors.