Physics
The p wave of a normal Electrocardiogram indicates

Ventricular repolarization
Atrial depolarization
Atrial repolarization
Ventricular depolarization

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Physics
Which is evidence that supports the dynamo theory?

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

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Physics
'Mirage' is an example of

Refraction of light only
Dispersion of light only
Total internal reflection of light only
Refraction and total internal reflection of light

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