Physics
What is the principle of a ''Life Jacket"?

It increases the volume of the person to keep him afloat
It provides oxygen to a drowning person
It decreases the volume of the person to keep him afloat
The person can sit on it like a raft

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Physics
Which is evidence that supports the dynamo theory?

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

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