What is this cool or dark and why

Those are cool colors because on the color wheel, blue and purple are rated cool. Cool colors are the colors from blue to green and purple. These colors are said to bring to mind coolness, like water.

Hope this Helps!

giovanni battista pergolesi, italian baroque composer who wrote one of the most famous settings of the stabat mater. don lorenzo perosi, catholic priest and director of the sistine choir under five popes.

option c (nickel) is not found in earth's crust. the earth's crust basically contains eight (8) elements namely: oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium (listed in order of abundance).