Seafloor Spreading (Grade 9)
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Seafloor Spreading
1.
Seafloor spreading is when new seafloor is formed when is forced upward.
- magma
- water
- soil
- calcium carbonate
2.
plates cause seafloor spreading when beneath an ocean.
- Convergent
- Divergent
- Transform
- Subduction
3.
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
4.
Earth's internal process that drives seafloor spreading is
- fusion.
- radiation.
- convection.
- conduction.
5.
Which scientist from the 1960s is credited with proposing the theory of seafloor spreading?
- Alfred Wegener
- Albert Einstein
- Charles Darwin
- Harry Hess
6.
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
7.
Due to seafloor spreading, oceanic crust is and sediment is on ocean ridge crests.
- old; thin
- old; thick
- young; thin
- young; thick
8.
Which of these is NOT evidence for seafloor spreading?
- magnetic evidence from trapped iron
- ocean floor age
- rock shapes
- water temperature
9.
Which process is seafloor spreading most closely associated with?
- erosion
- volcanism
- subduction
- metamorphism
10.
Describe the process of the seafloor spreading.
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