Oceanography Chapter 4

What is bathymetry?

• The study of ocean floor topography

• The study of atmospheric pressure

• The study of marine life

• The study of ocean currents

Who was the earliest known person to conduct bathymetric studies?

• James Cook

• Posidonius

• Charles Darwin

• Matthew Maury

What did the echo sounder on the USS Stewart reveal about the Mid-Atlantic Ridge?

• It was the deepest part of the ocean

• It coincided with coastlines on both sides of the Atlantic

• It was the warmest part of the ocean

• It was devoid of marine life

What is one advantage of multibeam echo sounders over simple echo sounders?

• They use less energy

• They can measure temperature

• They provide more detailed images of the seabed

• They are cheaper to operate

What is the typical arc coverage of a multibeam echo sounder?

• 90°

• 120°

• 150°

• 180°

How often is a pulse of sound energy typically sent toward the seabed in a multibeam system?

• Every 5 seconds

• Every 10 seconds

• Every 15 seconds

• Every 20 seconds

What is the purpose of "mowing the lawn" in the context of mapping the seafloor?

• To clean the ocean floor

• To create a complete map of an area

• To plant sea grass

• To measure water temperature

Who was the first to note the existence of the Mid-Atlantic Ridge and oceanic trenches?

• Dr. Sylvia Earle

• John Murray

• Jacques Cousteau

• Charles Darwin

What technology is used by scientists to explore submerged geological features?

• Submarines

• Remote manipulators

• Drones

• Satellites

What is the maximum depth that the HROV Nereus reached in the Mariana Trench?

• 10,920 meters

• 9,000 meters

• 8,500 meters

• 11,500 meters