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1. Divergent plate boundaries. The uplift of magma at the mid-ocean ridge is pushing the two plates apart.

2. The sea floor is older the further away from the mid-ocean ridge. (i.e. New crust is being formed at the mid -ocean ridge and pushing the older crust away.

3. 1 km = 100,000 cm / 3 per yr. = 33,333 years

4. rift zones, pillow basalts, black smokers, etc.

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