magnetic north pole 磁北极 ; 地磁北极 ; 磁北级
North Magnetic Pole 地磁北极 ; [地物] 北磁极
the north magnetic pole 北极 ; 北磁极
magnetic matrix north pole 北磁极
pole magnetic north 地磁北极
It help the geologists know how far these lava away from magnetic-north pole when it was erupted from the volcano.
这告诉地质学家这些岩石在从火山中喷发出来时，它们距离地球磁北极有多远。
The north Magnetic Pole is moving slowly northwest across the northern stretches of Canada.
北磁极在缓慢地通过加拿大北方向西北方向移动。
Kuo discovered that compasses do not point true north but to the magnetic North Pole. This was a decisive step to make them useful for navigation.
沈括发现，指南针并不是真正的指向北方，而是指向地磁的北极，这对指南针用于导航走出了决定性的一步。
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