This symbol is from a geologic map. what does the number 15 represent? number of faults in the area age of the rock in millions of years the steepness of the rock's incline

the steepness of the rock's incline

Explanation:

The geologic map represents the physical distribution of different types of rocks and the surficial deposits and hence the location of the geologic structure as folds and the faults. Given in the triangle, an angle of 15 degrees or slope shows us he steepness of the rocks that occurs along a fault plane and more the steep is the rock the more is the inclination upwards.

He got it right defiantly right