What is a Farm - Key Phrases From Pres. Obama's Rual Bus Tour

As President Obama makes his way through the Midwest, key phrases, concepts and ideas are brought to mind. On Wednesday, the president talked to farmers about farming.
Many people do not understand the importance of farming and farmland. Here is a little bit of information I researched and wrote while in training at Mahalo.com. Enjoy!
Farm: -
A farm is a unit of cultivated land set aside to grow, raise and produce agricultural products or fuel.1 Farms employ 17 percent of the labor force and the U.S. food and farming system contributes nearly $1 trillion to the United States national economy— which is more than 13 percent of the gross domestic product. 2
...and here is the president...