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Ocean Floor (Grade 8)

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Ocean Floor

These are formed as plates diverge and magma fills in and builds up in the open spaces.
  1. abyssal plains
  2. seamounts
  3. ocean ridges
  4. trenches
Which of the following is an undersea, volcanic mountain found on the ocean floor?
  1. abyssal plain
  2. seamount
  3. subduction
  4. sonar
Which of the following is a large, nearly flat region on the ocean floor?
  1. abyssal plain
  2. seamount
  3. subduction
  4. sonar
By drilling on the ocean floor, scientists have discovered that the                           rocks are found near                          .
  1. oldest, continents
  2. youngest, continents
  3. oldest, mid-ocean ridge
  4. youngest, mid-ocean ridge
Maps made from                 readings were some of the first used to show the ocean floor's topography is as varied as the continental surface.
  1. radar
  2. ping
  3. satellite
  4. sonar
These stretches of ocean floor are likely the flattest surfaces on Earth.
  1. continental shelf
  2. mid-ocean ridges
  3. abyssal plains
  4. desserts of the Sahara
Which feature of the ocean floor are cut by turbidity currents?
  1. longshore bars
  2. submarine canyons
  3. abyssal plains
  4. baymouth bars
The process in which the ocean floor plunges into Earth's interior is called                .
  1. construction
  2. subduction
  3. rifting
  4. convection
The movement of the ocean floor on either side of a mid-ocean ridge is best known as
  1. rifting.
  2. glaciation.
  3. ocean-floor spreading.
  4. subduction.
Describe the topography of the ocean floor.

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