Physics
If a barometric reading is falling, this usually indicates what

Decreasing pressure
Increasing pressure
None
No pressure

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Physics
Rainbow is due to

absorption of sunlight in minute water droplets
ionisation of water deposits
refraction and reflection of sunlight by water droplets
diffusion of sunlight through water droplets

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Physics
Which is evidence that supports the dynamo theory?

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
Granite and basalt conduct electricity

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