Physics
'Parsec' is the unit measurement of

Brightness of heavenly bodies
Astronomical distance
Orbital velocity of giant stars
Density of stars

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Physics
Which statement best describes an igneous intrusion?

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

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Physics
Railway tracks are banked on curves so that

Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train
The train may not fall down inwards

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