How does pitch favor spinners or fast bowlers sometimes?

The Cricket Pitch - The beautiful picture of the cricket pitch
@alienstar (5136)
India
February 15, 2007 3:51am CST
All cricket lovers must have heard about pitches favoring either spinners or sometimes fast bowlers or sometimes pitches are even favouring just for batsman..isn't it? how is it? how do they actually prepare such pitches?
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