At the Mid-Atlantic Ridge (and other places), material from the mantle is pushed upward and forces the crust apart, this results in continental drift.
... town the population is spread out with 30.3% under the age of 18, 8.1% from 18 to 24, 29.9% from 25 to 44, 23.8% from 45 to 64, and 7.9% who are 65 years of age or older. ...