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map legend, which provides a key to interpret the symbols and colors used in the map.
A political map
The standard scale used to rate the hardness of minerals is called the Mohs scale. It ranges from 1 (softest) to 10 (hardest), with each number representing a mineral that can scratch all those below it. Talc is the softest mineral with a rating of 1, while diamond is the hardest with a rating of 10.
No. Most of the symbols for elements are derived from their names in English. Most of the elements were not even known in ancient Greece.
Because it is more simple to write one or two letters than a word and also these symbols are valid in all languages.