The surface above the geographic North Pole is a constantly shifting bed of sea ice.
Photograph by Dan Westergren, National Geographic
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vehicle able to travel and operate above the ground.
an invisible line around which an object spins.
U.S. land continuously stretching from the Atlantic to Pacific oceans (not including the states of Alaska and Hawaii.)
disagreement or debate.
distance east or west of the prime meridian, measured in degrees.
half of the Earth between the North Pole and the Equator.
fixed point that, along with the South Pole, forms the axis on which the Earth spins.
large ice formation in seawater, pushed together by currents and winds.
object's complete turn around its own axis.
vehicle that can travel underwater.