The study also noted that when tilled soil particles come in contact with air, soil organic matter is lost through the process of oxidation.

VOA: special.2010.09.28

Cold weather moves south and combines with the last of the warm air from summer.

VOA: special.2009.06.09

Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite, a substance that can hold air, water and nutrients.

VOA: special.2009.04.21

He came out of the barn with his hands in the air.

VOA: special.2010.01.07

The air was filled with the sound of violent battle.

VOA: special.2010.07.17

From the air, much of South Louisiana still looks like a quilt dotted with picture frames.

VOA: standard.2010.06.17

State-owned media quote the president as saying he is dissatisfied with this month's global-warming summit in Copenhagen, calling it "a lot of hot air."

VOA: standard.2009.12.25

"There were some problems with some tactics, techniques and procedures, the way in which close air support was supposed to have been executed in this case, such that, at least with one of the aircraft involved, a B-1 bomber, that plane because of how it takes its bombing routes had to break away from positive I.D.

VOA: standard.2009.06.08