The hole in ozone is found at the poles. Antarctica has the
biggest hole.
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There is no hole in UV but in ozone layer. And the hole in ozone
layer is actually the thinning of the layer.
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Depends on what "tree" you put in
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If you need a hole to run wiring through then follow wiring to
an existing hole and work the new wire through. If it is a hole
that needs to be repaired, then small holes can be filled with a
silicon to waterproof them.