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

Absorption of corresponding wavelengths by the prism used in the photograph.
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 outer layers of the sun.

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General Science
Among the various allotrope of carbon

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

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