Coal is formed when peat is altered physically and chemically. This process is called coalification.. During coalification, peat undergoes several changes as a result of bacterial decay, compaction, heat, and time.
On January 9, 2011, ABC Family announced the show would return for its fourth season on March 26, 2011. On February 2, 2012, ABC Family renewed the series for a fifth season. On October 9, 2012, it was announced that the fifth season of The Secret Life of the American Teenager would be the final season. The series finale aired on June 3, 2013.
Following the success of its first season, ABC Family announced on January 31, 2009, plans to renew Secret Life, following the cancellation of its hit sci-fi TV show, Kyle XY.eason 2 began with 12 episodes broadcast starting June 22, 2009. Though marketed as the season finale, the mid season finale aired on September 7, 2009, with the second half of the season returning on January 4, 2010.