Misc: What is the circle of the earth at 0 degrees latitude?

Questions

The diameter of wool is measured in?

Gunpowder is formed after mixing charcoal, ______ and sulphur?

Gunpowder is formed after mixing charcoal, saltpetre and _______?

Plutonium was developed by deuteron bombardment of uranium-238 in a?

Oxygen, carbon, hydrogen and nitrogen make up ______% of the human body?