Physics
Which is evidence that supports the dynamo theory?

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

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Physics
Siphon will fail to work if:

Both its limbs are of unequal length.
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.
The temperature of the liquids in the two vessels are the same.

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