The leaf is a food factory for plants, an oxygen producer for aerobic organisms and a key component in the production of water for the earth. The leaf is the keeper of chlorophyll, a chemical compound which traps the energy from sunlight and uses it to convert the carbon dioxide, which it has taken in from the atmosphere, to oxygen and hydrogen. In the atmosphere, some of the oxygen will react with the hydrogen to create water. This is why places like Tennessee are so humid. The high amount of vegetation, means high water content in the air.
If you look closely at this leaf, you can see rectangle or block like outlines within the blade. These outlines from the rigid rectangular structures of the cells which comprise a leaf. When there are many put together, you can see the outline of their shape with the naked eye. To learn more about leaves go to: http://sciencewithme.com/learn-about-leaves/
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