Physics
Inside an aeroplane, flying at a high altitude,

the pressure is the same as that outside.
the pressure inside is less than the pressure outside.
normal humidity and partial vacuum are maintained.
normal atmospheric pressure is maintained by the use of air pumps.

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Physics
Which statement best describes an igneous intrusion?

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

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