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

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

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General Science
Among the various allotrope of carbon

Diamond is the hardest, graphite is the softest
Coke is the hardest, graphite is the softest
Diamond is the hardest, coke is the softest
Diamond is the hardest, lamp black is the softest

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