Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.
density of mercury is greater than that of water.

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Physics
Which is evidence that supports the dynamo theory?

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

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