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Why does the pole star appear stationary ?

because it is just above the earth's axis.

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earth spins on its axis and the pole star is directly above the axis of the earth.

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because it is located above the axis of rotation of the earth.

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I assume you mean polaris, the north star. Right now the earth's vertical axis (an imaginary line going through the north and south poles) points roughly directly at the north star. Thus when the earth rotates, it rotates along this axis, and so polaris never appears to move.

The colliary is that the earth's rotation is precessing, ie the north-south axis is wobbling, like the axis of a spinning top. In ten thousand years or so, the north-south axis will no longer be pointing at polaris.

 
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BECAUSE it is just above the EARTH'S AXIS!!!!!!!!

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This is because Pole Star is situated at the pointthrough which the axis of the Earth passes.

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The pole star is situated in the geographic north-poleof the earths axis.Thus its relativeto the earth does not change,and hence,it appears.`

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because it is above the eath axis and it's place was fix it's place never change

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pole star also moves a littile with the earth

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