Ocean Floor - Mid-Ocean Ridge

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Questions and Answers

What is the characteristic of the sediments in the profundal zone?

  • Coarse particles lacking a benthic macroflora
  • Fine particles largely made up of material produced within the lake (correct)
  • Dark colored sediments with abundant benthic macroflora
  • Light particles with high organic matter production

Why do old shells of gastropods and pelecypods accumulate in the sublittoral zone?

  • Due to the high oxygen levels in the sublittoral zone
  • Because they prefer the warmer temperatures in the sublittoral zone
  • Because the sublittoral zone serves as a cemetery for some littoral species (correct)
  • Because they are actively transported from the littoral zone

What effect can onshore winds have on coastal operations?

  • Extend 5 to 10 nautical miles offshore at speeds of 4 to 6 knots
  • Cause wind shear, heavy rain, hail, and high winds
  • Create taller waves and lift moist sea air over coastal hills (correct)
  • Reduce visibility and carry smoke, fog, and dust offshore

What does the benthos in a lake reveal about the conditions in the hypolimnetic water?

<p>The nature of the lake (B)</p> Signup and view all the answers

What is a common danger associated with terrain-forced thunderstorms?

<p>Hurting communications and airborne operations (D)</p> Signup and view all the answers

What geological feature is formed at a spreading center where two plates are drifting apart?

<p>Mid-Ocean Ridge (B)</p> Signup and view all the answers

What kind of volcanic feature is likely to form over hot spots in the ocean floor?

<p>Seamount (B)</p> Signup and view all the answers

At what rate are the plates spreading at the mid-ocean ridge, leading to new oceanic crust formation?

<p>2.5 centimeters a year (D)</p> Signup and view all the answers

What geological feature is formed when the peak of a seamount erodes and becomes a flat surface?

<p>Guyot (B)</p> Signup and view all the answers

What type of feature is likely to form when the peak of a seamount pierces the ocean surface?

<p>Volcanic Island (C)</p> Signup and view all the answers

What is the main concern for boats, submarines, swimmers, and torpedoes approaching shipwrecks?

<p>Visibility due to bioluminescent organisms (D)</p> Signup and view all the answers

How does the presence of bioluminescent organisms affect the visibility of a ship's wake?

<p>It can make the ship's wake visible up to 6 nautical miles (C)</p> Signup and view all the answers

Which factor can disturb the depth of the thermocline in the water?

<p>Tides or currents (A)</p> Signup and view all the answers

What characteristic differentiates the marine life in littoral areas from that in near-surface open ocean?

<p>Increased presence of marine life (B)</p> Signup and view all the answers

Which of the following can cause coastal currents to change rapidly, rendering current charts ineffective?

<p>Wind, tides, and sea surface slope (C)</p> Signup and view all the answers

What type of animals thrive in the continental shelf regions?

<p>Benthic species (A)</p> Signup and view all the answers

Which zone begins at the continental shelf break and is usually up to 20 km wide?

<p>Profundal zone (A)</p> Signup and view all the answers

What is the primary source of nourishment for microscopic plants and animals in the ocean?

<p>River and wave-washed sediment (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of land-fast ice?

<p>It increases the salinity of water (A)</p> Signup and view all the answers

Where do lake benthos typically reside?

<p>On the lake bottom (A)</p> Signup and view all the answers

How does wind shear affect Navy operations?

<p>It can cause turbulence, making missions dangerous for aircraft and helicopters. (C)</p> Signup and view all the answers

What happens when a river meets the ocean in terms of water density?

<p>Fresh river water flows into salty ocean water, creating density differences. (C)</p> Signup and view all the answers

How can reefs, bars, and channels impact the underwater environment?

<p>Bars and channels can alter the shape of the ocean bottom, posing challenges for submarines and divers. (A)</p> Signup and view all the answers

What is a potential danger associated with winds creating high waves at sea?

<p>The winds can block inland targets as waves become higher. (D)</p> Signup and view all the answers

How do differences in wind patterns above and around mountains affect the Navy's operations?

<p>It creates wind shear that can make helicopter landings unstable. (C)</p> Signup and view all the answers

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