An isotherm is a line on a map or chart of the earth's surface connecting points having the same temperature at a given time or the same mean temperature for a given period. Isotherm maps show where temperatures are relatively high and low, and also where temperature changes are gradual or dramatic over a distance.

Correct Option: D

An isotherm is a line on a map or chart of the earth's surface connecting points having the same temperature at a given time or the same mean temperature for a given period. Isotherm maps show where temperatures are relatively high and low, and also where temperature changes are gradual or dramatic over a distance.

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.

Correct Option: B

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.

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. Contour lines are curved or straight lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes. The configuration of these contours allows map readers to infer relative gradient of a parameter and estimate that parameter at specific places.

Correct Option: C

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. Contour lines are curved or straight lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes. The configuration of these contours allows map readers to infer relative gradient of a parameter and estimate that parameter at specific places.

Isohypse is a line on a map that joins points of equal elevation. It is also known as contour line.

Correct Option: C

Isohypse is a line on a map that joins points of equal elevation. It is also known as contour line.

The Survey of India produces a rich “base” of map information through systematic topographical surveys and the use of remote sensing images. Topographic maps provide the graphical portrayal of objects present on the surface of the earth. These maps provide the preliminary information about a terrain and thus very useful for engineering works.

Correct Option: D

The Survey of India produces a rich “base” of map information through systematic topographical surveys and the use of remote sensing images. Topographic maps provide the graphical portrayal of objects present on the surface of the earth. These maps provide the preliminary information about a terrain and thus very useful for engineering works.