#RFB-11000287Reading: Fill in the BlanksAcademic,CoreHard

Mapping Software

Official Question Material
Prep: Varies

Mapping software works with your phone's GPS for the location and then the in-built [blank] finds north, adjusting to the direction you're facing and [blank] the way. But that's not easy because there are two 'norths'. There's [blank] north - which is the direction of the North Pole and which reliably stays put - and there's [blank] north which, thanks to the flowing layer of molten iron in the Earth's outer [blank] , has a habit of [blank] around.

Sample Answer & Audio Transcript

Mapping software works with your phone's GPS for the location and then the in-built compass finds north, adjusting to the direction you're facing and pointing the way. But that's not easy because there are two 'norths'. There's true north - which is the direction of the North Pole and which reliably stays put - and there's magnetic north which, thanks to the flowing layer of molten iron in the Earth's outer core , has a habit of moving around.
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