I writing a short story for english and I need to know what can penitrte the skull?
Anything that is fast enough. The softer it it, the faster it has to be. A chunk of watermelon accelerated to 2000 mph might crush a skull. Or an iron bar falling from the roof of a building.
And the word is penetrate, NOT penitrate. (In case you want to use it in the short story for your English class.)
Knives & bullets first come to mind, but actually almost anything can penitrate the skull with enough force behind it. Anything from tree limbs to rocks to car rear view mirrors have been removed from people's skulls following accidents or other trama.
xrays can penetrate bone, the machine is set to a certain power level (kVp) so that an certain amount of penetration is used to give an optimal image.
just about anything with enough force behind it. i guess it would depend on what you want to do wih the bone.
A bullet or even another bone, if enough force is exerted.
a rock, knife, bowling ball, sharp stick...
A glare from Chuck Norris.