GEOGRAPHY HIGH SCHOOL

Which of the following is NOT evidence of sea-floor spreading? A. the alternation of polarity in segments of the ocean floor B. the relationship between earthquakes and plate boundaries C. analysis of seafloor sediments D. the distribution of ice sheets across the planet

Answers

Answer 1
Answer:

The statement that is not one of the evidences of seafloor spreading is the distribution of ice sheets across the planet.

  • Harry Hess's gave an hypothesis about seafloor spreading. He collected several pieces of evidence to support the theory.

This evidence was obtained from the studies of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes.

Seafloor spreading often taakes place at divergent plate boundaries.

The spreading is known as a process that occurs at mid-ocean ridges and it is the point of new oceanic crust formation.

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Answer 2
Answer:

Answer:

The answer is D (the distribution of ice sheets across the planet)

Explanation:

  • Seafloor spreading is a geomorphic process where there is a slow accumulation of new oceanic crust in the ocean floor through a volcanic action while moving the older rocks away from the mid-oceanic ridge. The mid-ocean ridge is located where the seafloor spreading process occurs, in which tectonic plates divide from one another.
  • The theory of Seafloor spreading was proposed by an American geophysicist, Harry H. Hess in 1960. Another theory named “The Continental Drift” of Alfred Wegener in 1912 is supported by this hypothesis on the shift position of the earth’s surface.

Sea Floor Spreading Evidence

Harry Hess’s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory.  

  • Molten material
  • Seafloor drill
  • Radiometric age dating and fossil ages
  • Magnetic stripes

So, the distribution of ice sheets across the planet is not evidence of sea-floor spreading.

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Keywords: seafloor spreading, geomorphic process, molten material, magnetic strips, hypothesis

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