One reason that the teenage pregnancy rate in most european nations is less than half of that in the united states may be because:

The reason is because birth control is less expensive and easier for teens to get in many other developed countries than in the United States. And teachers, parents and physicians tend to be more accepting of teenage sexuality and more likely to encourage use of contraception, said Sarah Brown, chief executive of the Washington, D.C.-based National Campaign to Prevent Teen and Unplanned Pregnancy.

Afine-grained igneous rock forms as a result of slow cooling.