Physics
Why does the sea appear blue in colour?

Refraction of the sun light
Interference of the sun light from water surface
Scattering of the sunlight by water molecules
Reflection of the sun light from water surface

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Physics
Which is evidence that supports the dynamo theory?

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

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