Question

Isolines have all the properties EXCEPT the following:

a. They may cross each other.
b. The numerical difference between isolines are intervals.
c. They were first used on a map about 300 years ago.
d. Close isolines indicate a steep gradient.
e. They are always closed loops.

Answer 1

Answer:

C. They were first used on a map about 300 years ago

Explanation:

This is the only incorrect option, isoline's usage are less than 200 years old