Physics
Magnetic keepers are used to protect magnets from :

Earth's magnetic field
Demagnetization due to heating
Effect of other magnets
Self-demagnetization

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Physics
Which statement best describes an igneous intrusion?

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

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