A light that is caused by the sun
Solar Flux or Solar irradiance would be a couple of alternatives.
survival
Block means a brick
He is the symbol for Helium in a scientific setting.
Cleavage is a term referring to how a crystal cleaves, that is, fractures when struck.
something about matter color and mass
If you mean changes, it's acceleration.
It inplies that the individual brightens your day. California and South Dakota have both been called the Sunshine State and Florida still uses that term on their license plates.
Internal, usually relating to the body or an organ.
Not literally "walk on sunshine " is a term for the feeling you have when you are really happy and you have no real problems in life.
No. Sunshine is a term of endearment (I.E. The light of someone's life).
The scientific term is 'strata'.