Physics
Which is evidence that supports the dynamo theory?

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

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

It follows the wave path near the tropopause at elevations of 8 km to 15 km.
It is narrow band of high-velocity wind.
Jet streams are typically continuous over long distances.
In summer, the polar front jet achieves its maximum force.

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