Answer:
Option (1)
Explanation:
Isohyets- This are the lines that connects the points of equal amount of rainfall that occurs at any given period of time.
Contour lines- This are the lines of equal elevation.
Isotherms- This are the lines that connects the points of equal temperature.
Isobars- This are the lines connecting the points of equal atmospheric pressure.
Isogrids- This are a type of half hollowed-out structure that is created mostly from a single metallic type of plate with hard triangular rib like structures that are commonly known as stringers. This are very light and hard in comparison to other substances, This are very costly to build, so they are basically used for the applications that are usually related to the spaceflight and also used in the field of aerospace.
Thus, the isogrids are not a common type of isoline.
Hence, the correct answer is option (1).
