Multiple choice

Where does sea-floor spreading occur?

  1. the Rockies

  2. the Andes

  3. deep ocean trenches

  4. mid-ocean ridges
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sea-floor spreading occurs at mid-ocean ridges, where divergent tectonic plates pull apart, allowing magma to rise and form new oceanic crust. Deep ocean trenches are where old crust is subducted and destroyed, not where spreading occurs.

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