"Dose" is a measured portion of a medicine. I am not aware of any volcanic ash clouds that have anything to do with measured quantities of medication!
The volcanic ash burst and formed a huge cloud.
A volcanic explosion is an eruption.
what does key mean in math
a
about
Approximately
I do not know of such a word related to math(s)
There is no such math word, so it does not mean anything. You may wish to check your spelling before posting questions!
the word by means 'times' or 'multiply'
The word at means the least
its mean like well its a math term its like distrubed fractions
it mean per rate