Give a geographical reason for each of the following:
(i) Lines of longitude are called meridians of longitude.
(ii) Lines of longitude are of same length.
(iii) Diametrically opposite lines of longitude and the Equator are called Great Circles.

(i) Lines of longitude are called meridians of longitude because the sun crosses a meridian at noon. So, all places on a particular meridian will have noon at the same time.

(ii) Lines of longitude are of same length as they all converge at the poles.

(iii) Diametrically opposite lines of longitude and the Equator are called Great Circles because they pass through or touch the centre of the circle. Also, they have a radius equal to the radius of the sphere's centre.