Part A

Define the following leveling terms: $($a$)$ leveling, $($b$)$ level surface, and $($c$)$ geoid.

Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

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Leveling is the process of finding Blank of points or their differences in it$.$target $1$ of $3$

Level surface is a curved surface that at every point is perpendicular to the Blank $($the direction in which gravity acts$).$target $2$ of $3$

Geoid is a particular level surface that serves as a$($n$)$ Blank for all elevations and astronomical observations.