Physics
Which of the following are used for accurately measuring very small time intervals ?

Pulsars
Atomic clocks
Quartz clocks
White dwarfs

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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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