By what the two poles of the earth
are covered?​

Explanation:

Because all longitudinal lines begin from it, the North Pole has no time zone. The pole is surrounded by the Arctic Ocean, where the water is 13,400 feet (4,084 meters) deep and usually covered with drifting ice 6-to-10 feet (1.8 to 3 m) thick.

I hope it's helpful!

The Two poles are covered with thick ice and sorrounded by Arctic Ocean which is frozen.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

plasma - state of matter made up of electrically charged particles