Answer:
Fault line - Very dark and thick line .
Contact line - very light and thin line
Axis fold - slightly dark and thick line.
Strike and dip - looks like a stubby T
Explanation:
Faults are represented by dark and thick lines.
Contact lines are used to mark the separation of regions of different colors or any rock unit on any geologic map by using very light and thin line.
A fold axis is used to represent the ridges of a fold on any geologic map and thus semi dark and thick lines are used for representing a fold axis
The strike and dip represents tilted rock structures which are represented by stubby T
