On a topographic map, five contour lines are very close together. The contour interval is 100ft.

How high is this feature?

Answer: 400ft

?????

How do you know that?

Five contour lines that are 100ft would equal to 500ft

Right. I misread the question the first time.

ecause sea level is 12

To determine the height of the feature indicated by the five closely spaced contour lines on a topographic map, you can use the contour interval and count the number of lines crossed.

In this case, the contour interval is given as 100 feet, meaning that each contour line represents a change of 100 feet in elevation. Since there are five contour lines close together, we need to count the number of lines crossed to determine the total change in elevation.

Since the contour lines are closely spaced, it means that the feature is steep and the elevation change is significant. If we assume that each of the five contour lines crossed represents a change of 100 feet, then the total elevation change would be 100 feet multiplied by five lines, which equals 500 feet.

However, it's important to note that the fifth contour line may not represent a full 100-foot elevation change. It could be a partial line, indicating a smaller change in elevation.

Without more specific information about the exact representation of the fifth contour line, we can assume a conservative estimate. Let's say the fifth contour line represents a change of 20 feet in elevation (which is less than 100 feet). In this case, the total elevation change would be 100 feet multiplied by four lines, which equals 400 feet.

So, based on the given contour interval of 100 feet and the five closely spaced contour lines, a conservative estimate for the height of this feature would be 400 feet.