Physics
The basic reason for the extraordinary sparkle of suitably cut diamond is that

It has well defined cleavage planes
It has a very high refractive index
It has a very high transparency
It is very hard

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Physics
Which statement best describes an igneous intrusion?

Magma is exported to an open area and forms iron
Magma is injected into surrounding rock forming an igneous intrusive
Magma explodes to the surface and forms a smooth outer layer of rock
Igneous intrusion for when ice crystals splash into lava

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