Earth Magnetism Flashcards
1
Q
What are isogonals
A
lines joining equal mag var
2
Q
What are agonic
A
lines joining zero var
3
Q
what are isoclinicals
A
lines joning equal mag dip (not on maps)
4
Q
what are aclinic lines
A
lines joining zero dip (not on maps)
5
Q
where is mag compass most effective?
A
mag equator
6
Q
sensitiuve of DRC is ?
A
proportional to earth’s horizontal component
7
Q
max dip value?
A
90
8
Q
what are grivations
A
combinations of var and dev
