Answer:
1. Changes in elevation
Step-by-step explanation:
You want to know what concentric contour lines indicate.
A contour line joins points on a map that have equal elevation. Concentric contour lines will indicate increasing or decreasing elevation, hence changes in elevation.
Concentric contour lines that form closed loops indicate elevation is increasing to a peak or decreasing to a depression.
Lines connecting points on a map that have the same temperature are called isotherms. Lines of constant pressure are called isobars. Similar lines may describe the boundaries of vegetation or rock types. Maps utilizing these kinds of lines look very similar to topographic contour maps.
Concentric contour lines indicate changes in elevation, choice 1.
Concentric contour lines on a topographic map signify changes in elevation, commonly representing hills or depressions, and are crucial for understanding an area's topography.
Concentric contour lines on a topographic map indicate changes in elevation. When these lines form closed circles, they typically represent hills or mountains if the lines are concentric circles with elevation values that increase towards the center. Conversely, they may indicate depressions or basins if the center of the circles has hachure marks indicating lower elevations towards the center. Contour lines are essential for understanding the shape of the Earth's surface and help geologists, among others, to visualize elevation differences and the topology of an area.
