Isolines have all the properties EXCEPT the following: options: The numerical difference between isolines are intervals. They may cross each other. They were first used on a map about 300 years ago. Close isolines indicate a steep gradient. They are always closed loops.
The Correct Answer and Explanation is :
The correct answer is: They may cross each other.
Explanation:
Isolines are lines on maps that connect points of equal value for a specific variable, such as elevation, temperature, pressure, or population density. These lines are used extensively in various fields, including geography, meteorology, and topography, to represent data in a visual format. Here’s a breakdown of the properties and why the option “they may cross each other” is incorrect:
- The numerical difference between isolines are intervals: This is true. The spacing between isolines corresponds to the difference in the value of the variable being measured. For example, in contour maps, the isolines (contours) typically represent elevation intervals, and the difference between each contour line is a consistent value, such as 10 meters.
- They may cross each other: This is false. Isolines should never cross each other because it would imply that one location has two different values for the same variable, which is not physically possible. For instance, if two isolines representing elevation crossed, it would mean a single point had two different elevation values, which is illogical.
- They were first used on a map about 300 years ago: This is true. Isolines were first introduced in the 18th century by a Scottish engineer and scientist named James Clerk Maxwell. They were used in early maps to represent the distribution of certain physical properties, such as temperature and elevation, making them a significant tool in modern mapping.
- Close isolines indicate a steep gradient: This is true. When isolines are closely spaced, it means that the variable being measured changes rapidly over a small area, indicating a steep gradient. For example, in contour maps, closely spaced contours represent steep slopes, while widely spaced contours indicate a gentle slope.
- They are always closed loops: This is true, though it’s important to note that isolines do not have to form perfect loops in every case. They can form open loops if they represent a bounded region or if they extend to the edge of the map. However, in many cases, isolines will eventually close around a feature, such as a mountain peak or depression.
Image:
I’ll now generate an image that illustrates isolines, showing both correct and incorrect representations.
Here is an illustration showing isolines, with some correctly spaced to indicate steep gradients, and others crossing each other, which is the incorrect property. This helps visualize the concept of isolines in a practical setting. Let me know if you need further details!
