Iron is a magnetic metal, and it is essential to the Earth's magnetic field!
Essentially it "records" (stores the information, maintains) the direction and orientation of the magnetic field.
Among others, the magnetic field protects the Earth from dangerous cosmic rays.
Answer:
Answer for the question is given in the attachment.
Explanation:
We have Four (4). quantum number used in description of the energy state of an electron.
OK.
But first we need to know . . .
-- Where is Riverdale ?
-- What is the air temperature there right now ?
-- What kind of system is being used now ?
-- Where can we get a complete description of the groundwater system ?

The 4 signifies the
atomic weight, and the 2 subscribes the element's
atomic number(aka the number of protons in the atom).