Physics
Radiocarbon is produced in the atmosphere as a result of

Action of ultraviolet light from the sun on atmospheric oxygen.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Lightning discharge in atmosphere.

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Physics
Which is evidence that supports the dynamo theory?

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
Granite and basalt conduct electricity

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