Do you know the difference between Black & Green Tea?

Do you know the difference between Black & Green Tea? 6/10/2010
I am sure that like me you were well aware that Tea comes from the 2 to 4 top leaves of a variety of Camellia and not from Beans from a tree like Coffee. But do you know that difference between Green & Black tea? I knew that the very best teas were/are those only picked from the two top leaves from the variety of Camellia called “Sinensis”. {Which is just one of about 90 different species of camellia and not one of the 3 main varieties you see in many Gardens. And many currently in full flower. (At least In Australia!)}
I knew all this (from my time working with a Camellia connoisseur many, many years ago now.) Yes, I knew that, but I didn’t know the real difference between Black and green tea , although I have drunken and like both! Do you know the difference? Apart from the colour that is! Did you even know that there were in fact six basic varieties of tea? They are white, yellow, green, black, oolong, and pu-erh. (Other types of tea come from other types of plants, but these 6 all come from the same plant?) Well they do, but the differences are determined by how they are processed.
According to the “Hot word” from Word of the Day” for Oct.6th – 2010:”Green tea, for example is dried, but not wilted, and it doesn’t go through enzymatic oxidation, which the tea industry calls fermentation. Black tea is wilted and also fully oxidized. The process to make oolong tea is somewhere between the two. It is wilted, bruised, and partially oxidized.
The taste of green tea is often described as light and grassy, while black tea usually has a stronger, sweeter taste. Oolong tastes more similar to green tea with a sweet aftertaste.
Many Americans may not have heard of oolong. The Earl Grey tea blend, though is far more familiar. Its distinct flavor and aroma comes the addition of an oil that has been extracted from the rind of the bergamot orange.”
I’m guessing that many Australians (&at least this one are like the many Americans mentioned above, and have not heard of “Oolong tea.” Have you?
In fact have you heard/tasted white or even yellow, let alone “Pu-erh” tea? Your comments please?