Physics
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in

4.2 seconds
42 years
42 seconds
4.2 years

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Physics
Hydro-electric power is a:

non-renewable natural resource
Neither renewable nor non renewable resource
A mixture of renewable and non-renewable natural resource
Renewable natural resource

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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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