'(<a href="http://www.j-archive.com/media/2010-11-17_DJ_14.wmv">Sarah of the Clue Crew shows an animation on the monitor.</a>)  When a wetland becomes covered with plant material, the lack of oxygen hinders decay, so that over time a layer of partially decayed matter is formed, called this'
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PLANT SCIENCE: When a wetland becomes covered with plant material, the lack of oxygen hinders decay, so that over time a layer of partially decayed matter is formed, called this
When a wetland becomes covered with plant material, the lack of oxygen hinders decay, so that over time a layer of partially decayed matter is formed, called this
When a wetland becomes covered with plant material, the lack of oxygen hinders decay, so that over time a layer of partially decayed matter is formed, called this
PLANT SCIENCE
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PLANT SCIENCE