Physics
A water tank appears shallower when it is viewed from top due to

Refraction
Reflection
Rectilinear propagation of light
Total internal reflection

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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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