Physics
Which statement best describes an igneous intrusion?

Magma is exported to an open area and forms iron
Igneous intrusion for when ice crystals splash into lava
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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Physics
Purpose of an optical filter is to

Transmit or absorb light of different colours
Dispense light into component colours
Reflect lights of different colours
Refract light of different colours

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