11. the zero declination line on a map is also known as the ____________ line a.

Question

11. the zero declination line on a map is also known as the ____________ line a. agonic b. isometric c. isogonic d. graticule 12. on a 24" sewer pipe are several manholes. Manhole # 7 is at sta. 10+77.14. Downhill from manhole # 7 is manhole #8 at sta. 8+50.02. thew IE of MH-7 is 115.76. The slope between the two manholes is 3.80%. what is the IE of manhole #8? a. 8.64 b. 107.13 c.863.1 d. 1077.14 13. on a map the lighter lines shown between index contours are called a. contour interverals b. downhill index contours c. intermediate contours d. horizontal contours

Explanation / Answer

Magnetic declination is the angle between compass north (the direction the north end of a compass needle points) and true north. The declination is positive when the magnetic north is east of true north. The term magnetic variation is a synonym, and is more often used in navigation. Isogonic lines are where the declination has the same value

ISOGONIC

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