Explore the World Above

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Questions and Answers

What is the term used to describe the flat area off the coast of Florida?

  • Underwater volcano
  • Ridge
  • Continental shelf (correct)
  • Ocean trench

What causes the little bumps seen in the deep ocean on the elevation profile?

  • Underwater volcanism (correct)
  • Ocean currents
  • Sediment erosion
  • Plate tectonics

What is the term used to describe the underwater volcanoes created by subduction or hot spots?

  • Continental shelf
  • Ocean trench
  • Ridge
  • Seamounts (correct)

Which type of satellite imagery provides more detailed information about the sea floor?

<p>Satellite imagery (D)</p> Signup and view all the answers

What causes slight disturbances on the surface of the ocean?

<p>Sea mounts (C)</p> Signup and view all the answers

How do satellites measure the height of structures on the sea floor?

<p>By detecting gravitational anomalies (A)</p> Signup and view all the answers

What type of boundary is represented by the deep blue lines on the map?

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

Which device allowed for a large-scale mapping of the ocean floor?

<p>Multi-beam echo sounder (A)</p> Signup and view all the answers

What is the purpose of the deep scattering layer?

<p>To reflect sound waves (C)</p> Signup and view all the answers

What technology helped confirm seafloor spreading?

<p>Precision depth recorder (B)</p> Signup and view all the answers

What technology is used to measure the seafloor from space?

<p>Mapping from space (B)</p> Signup and view all the answers

Which method is used to explore the Earth's crust using artificially generated waves?

<p>Seismic reflection (D)</p> Signup and view all the answers

What is the purpose of seismic reflection?

<p>To locate oil and gas reservoirs (C)</p> Signup and view all the answers

What are the three major provinces of the ocean?

<p>Continental margins, deep ocean basins, and mid-ocean ridges (A)</p> Signup and view all the answers

What is a bathymetric profile?

<p>A line drawn across the ocean to show the seafloor features (C)</p> Signup and view all the answers

What is bathymetry?

<p>The measure of the distance from the top of the water to the bottom of the ocean. (C)</p> Signup and view all the answers

When was the first systematic measurement of the ocean conducted?

<p>1872 (B)</p> Signup and view all the answers

What did the early sea goers use to measure the sea floor?

<p>Fathoms (D)</p> Signup and view all the answers

What did the early measurements of the ocean floor reveal?

<p>The ocean floor had deep mountains. (D)</p> Signup and view all the answers

What type of boundary is represented by the mid-Atlantic ridge mentioned in the text?

<p>Divergent plate boundary (B)</p> Signup and view all the answers

What are the linear cracks formed at transform boundaries called?

<p>Faults (D)</p> Signup and view all the answers

What are the rounded structures formed by cooling magma on the seafloor called?

<p>Pillow basalts (A)</p> Signup and view all the answers

What allows water in hydrothermal vents to reach temperatures higher than boiling?

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

What are the two types of continental margins?

<p>Active and passive (C)</p> Signup and view all the answers

What is the continental shelf?

<p>The first part of the continental margin (A)</p> Signup and view all the answers

What causes the formation of a deep ocean trench?

<p>Subduction of oceanic crust under continental crust (B)</p> Signup and view all the answers

What is the distinguishing feature of an active continental margin?

<p>Tectonic activity (A)</p> Signup and view all the answers

What is the continental shelf?

<p>A flooded part of the continent (A)</p> Signup and view all the answers

What is the continental slope?

<p>The area where the mountains meet the valley (D)</p> Signup and view all the answers

What are submarine canyons?

<p>Narrow and V-shaped canyons (B)</p> Signup and view all the answers

Where are the oldest seafloor typically found?

<p>On the continental shelf (D)</p> Signup and view all the answers

What causes turbidity currents?

<p>Underwater landslides (A)</p> Signup and view all the answers

What is the characteristic feature of turbidity currents?

<p>They are supported by water (D)</p> Signup and view all the answers

What is the term used to describe the sediment deposit caused by turbidity currents?

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

What is the characteristic of suspension settling in the abyssal plains?

<p>Particles settle out slowly (B)</p> Signup and view all the answers

What is the name for underwater mountains that have poked through the sea floor?

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

What is the term used to describe flat areas on the sea floor that were once above the surface of the water?

<p>Table mounts (A)</p> Signup and view all the answers

What is the name for the deepest part of the ocean?

<p>Mariana trench (A)</p> Signup and view all the answers

What is the name for the longest mountain chain on the planet?

<p>Mid-ocean ridge (C)</p> Signup and view all the answers

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