Physics
Which is evidence that supports the dynamo theory?

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

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Physics
A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that

The rubber ball suffers greater change in momentum
The initial momentum of the rubber ball is greater than that of the metal ball
The metal ball suffers greater change in momentum
Both suffer the same change in momentum

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