Physics
The sky appears blue because of

Scattering of light
Emision of blue wavelength by the sun
Atmospheric water vapour
Reflection on sea water

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Physics
The mass defect is the result of what action occurring?

Energy being converted into moles of atoms when neutrons break apart protons
Mass being converted to energy when protons and neutrons break apart in a nucleus
Protons and electrons being attracted to each other
Mass being converted to energy when protons and neutrons bind together in a nucleus

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