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.
Season 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.The second 12 episodes finished their run on March 22, 2010.The season premiere of Secret Life brought in the largest audience for the show so far, with a record breaking 4.68 million viewers.It brought in the second largest audience in adults 18-34 with 1.40 million viewers, behind season one's mid-season finale.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.