Physics
Ozone layer in the outer atmosphere helps us in

Absorbing UV radiations
Absorbing cosmic ray particles
Regulating the temperature of atmosphere
Reflecting radio waves and makes radio communication possible

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

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

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