Physics
Which statement best describes an igneous intrusion?

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

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Physics
Stars twinkle because

the intensity of light emitted by them changes with time.
the refractive index of the different layers of the earth's atmosphere ch
None of these
the distance of the stars from the earth changes with time.

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