Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

They fly inactively
They have extra air sacs
They use less oxygen
Their lungs are very large

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Physics
The sky appears blue because

It is actually blue
In white light, the blue component dominates
The atmosphere scatters blue colour more than the others
All colours interfere to produce blue

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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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