General Science
The age of most ancient geological formations is estimated by

Ra - Si method
Uranium - lead method
Potassium - argon method
C14 method

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General Science
The dark lines in the solar spectrum are due to

Absorption of corresponding wavelengths by the outer layers of the sun.
Absence of corresponding wavelengths from the light emitted by the core of the sun.
Destructive interference between waves of certain definite wavelengths.
Absorption of corresponding wavelengths by the prism used in the photograph.

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