The imaginary lines on a map that are used to join places of the same altitude are called:Group of answer choicesNorth linesLegend linesContour linesGrid lines

The imaginary lines on a map that connect places of the same altitude are called contour lines. These lines represent elevation and help to illustrate the terrain of an area.

Explanation:

1. Contour Lines: They are crucial in topographic maps and allow users to understand the landscape's relief. Each contour line represents a specific elevation level. When contour lines are close together, it indicates a steep slope; when they are further apart, it suggests a gentle incline.

2. Other Options:

   • North Lines: These refer to lines that indicate the direction of north on a compass, typically used in navigation.
   • Legend Lines: This is not a standard geographical term. The legend on a map provides explanations of symbols used in the map.
   • Grid Lines: These are used for location referencing, often forming a coordinate system on maps.

Conclusion:

Therefore, the correct answer to the question is Contour lines.