Simplify the following text for a Grade 11 native English-speaking person.
Original: At the Mid-Atlantic Ridge ( and other places ) , material from the upper mantle rises through the faults between oceanic plates to form new crust as the plates move away from each other , a phenomenon first observed as continental drift .
Simplified: At the Mid-Atlantic Ridge ( and other places ) , material from the upper mantle rises through the faults between oceanic plates to form new crust as the plates move away from each other .