Physics
Which is evidence that supports the dynamo theory?

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

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
The temperature of the liquids in the two vessels are the same.
The densities of the liquid in the two vessels are equal.
The level of the liquid in the two vessels are at the same height.

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