Answer:
The numbers indicate the amount of air pressure, in millibars, that each line represents. These lines and numbers are necessary find out exactly where High and Low pressure systems are on the maps.
Answer:
developing
Explanation:
Because they are always growing and evolving
The land and the colors of the earth
17-1800's
I know that James Hutton is considered a father of modern geology and he was born during some where in the 1720's so that's the closest answer, also Charles Lydel was born during the late 1790's.
