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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Physics
A drop of liquid assumes spherical shape because:

A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids
A sphere has the least surface area for a given volume
Inter molecular forces are weak in liquids

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Physics
The blue colour of sky is due to

Reflection of sunlight
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere
Scattering of shorter wavelengths of sunlight in the atmosphere

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