What shapes the seabed according to the key concepts?

• Erosion

• Tectonic forces

• Ocean currents

• Volcanic activity

What is the seabed depth in feet?

• 30,000 feet

• 32,000 feet

• 35,818 feet

• 38,000 feet

What did the echo sounder on the USS Stewart help to reveal?

• The location of the Bermuda Triangle

• The Mid-Atlantic Ridge

• The deepest part of the Pacific Ocean

• The Great Barrier Reef

What happens when the depth is great in echo sounding?

• Sounds reflect from a large area of seabed, hiding details

• Sounds travel faster

• Sounds become clearer

• Sounds are absorbed by the water

What is the purpose of "mowing the lawn" in the context of multibeam systems?

• To clean the seabed

• To create a complete map of an area

• To measure water temperature

• To track marine life

How many radar pulses does the U.S. Navy's satellite use each second?

• About 500

• About 1000

• About 1500

• About 2000

Who is Dr. Sylvia Earle discussing in the document?

• John Murray

• Charles Darwin

• Isaac Newton

• Albert Einstein

How accurate was the Geosat satellite in measuring sea surface height?

• Within 1 meter

• Within 0.03 meter

• Within 0.1 meter

• Within 0.5 meter

What is the function of radar energy pulses in oceanographic research?

• To measure temperature

• To measure sea surface height

• To track marine life

• To detect pollution levels

What is the general range of contours in the cross section of the Atlantic Ocean basin?

• Depth in meters

• Height in feet

• Depth in feet

• Height in meters