Seafloor Spreading (Grade 9)
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Seafloor spreading is when new seafloor is formed when is forced upward.
- calcium carbonate
plates cause seafloor spreading when beneath an ocean.
Of the answers below, which one is evidence of seafloor spreading?
- puzzle like fit of the continents
- magnetic reversal evident at mid-ocean ridges
- fossil evidence found in South America and Africa
- climate clues
The earth's internal process which drives seafloor spreading is
Which scientist from the 1960's is credited with proposing the theory of seafloor spreading?
- Alfred Wegener
- Albert Einstein
- Charles Darwin
- Harry Hess
Which is the best estimate of seafloor spreading rates?
- 1 - 10 mm/yr
- 1 - 10 cm/yr
- 1 - 10 m/yr
- 1 - 10 km/yr
Due to seafloor spreading, oceanic crust is and sediment is on ocean ridge crests.
- old; thin
- old; thick
- young; thin
- young; thick
Which of these is NOT evidence for sea floor spreading?
- magnetic evidence from trapped iron
- ocean floor age
- rock shapes
- water temperature
Which process is seafloor spreading most closely associated with?
Describe the process of the seafloor spreading.