SOLUTION: The North Atlantic Ocean is 3600 km wide. Sea-floor spreading along the Mid-Atlantic Ridge occurs at 2cm per year. When did rifting start to open the Atlantic?

Question 831450: The North Atlantic Ocean is 3600 km wide. Sea-floor spreading along the Mid-Atlantic Ridge occurs at 2cm per year. When did rifting start to open the Atlantic?

Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Express cm in terms of km
( 2 cm ) x ( 1m / 100 cm ) x ( 1 km / 1000 m )

-----------------------
( km ) / ( km/yr) = yrs

The rift started to open 1,800,000,000 yrs ago
This is 1 billion 800 million yrs ago

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