Final answer:
Meridians are imaginary lines on the Earth used to measure longitude, intersecting with parallels at right angles.
Explanation:
Meridians are imaginary lines on the Earth that run from pole to pole. They are great circles that help in determining locations on the globe and play a crucial role in measuring longitude. Meridians intersect with parallels at right angles and are spaced closest at the poles and farthest apart at the equator.
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