Concept:Lines of longitude describe the imaginary reference lines running from one pole to the other.
Explanation:Lines of longitude are called meridians.
They are imaginary lines drawn on the globe from the North Pole to the South Pole.
Each line is a semi-circle of equal length and runs in a true north–south direction.
The prime meridian at
0∘ passes through Greenwich.
Options B and C describe measurements of longitude and latitude, not the lines themselves.
Option D is wrong because meridians do not number from
0 to
90∘; they extend to
180∘ east and west.
Answer:A. imaginary line on the earth’s surface joining the north and the south pole.