Physics
At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of

Charle's Law
Gay-Lussac's Law
Boyle's Law
Avogadro's Law

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Physics
Inside an aeroplane, flying at a high altitude,

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

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Physics
Which is evidence that supports the dynamo theory?

Earth's core contains a large amount of iron
Granite and basalt conduct electricity
Convection occurs in Earth's inner core
Earth's outer core contains liquid that conducts electricity

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