are
i) Lines connecting places with equal heights are
ii) Reference maps are maintained by
Answers
Explanation:
1)In cartography,
a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. The contour interval of a contour map is the difference in elevation between successive contour lines.
2)Reference maps show the boundaries and names of geographic areas for which the Census Bureau tabulates statistical data, but do not visualize the data.
Explanation:
ANSWER ✍️
1)In cartography,
a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. The contour interval of a contour map is the difference in elevation between successive contour lines.
2)Reference maps show the boundaries and names of geographic areas for which the Census Bureau tabulates statistical data, but do not visualize the data.