music: Pop Rock: They are considered to be the first heavy metal band.?

Questions

what percentage of the earth's crust is salty?

what type of insect performs a waggle dance?

if a chemical is 'anhydrous' what does it not contain?

a gas produced by the incomplete combustion of coal in a mine fire is very poisonous, what is its chemical name?

what is the name for a narrow necked wine or spirit container of more than two gallon capacity?