Physics
The ordinary and maximum tolerance limit of sound by human being is

70 db to 85 db (decibel)
50 db to 70 db (decibel)
60 db to 80 db (decibel)
65 db to 75 db (decibel)

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Physics
Which statement best describes an igneous intrusion?

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

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