Physics
Which is evidence that supports the dynamo theory?

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

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Physics
Light houses are places with powerful lights to :

Guide and help large crowds at religious gathering during nights
Indicate to the incoming warships, the location of a harbour during night
Guide and resolve traffic jams in crowded metro-cities during nights
Guide and warn the ships coming from different directions in the ocean

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