Solution:
A great circle always divides the Earth in half, thus the Equator is a great circle (but no other latitudes) and all lines of longitude are great circles.

Solution:
If the difference in time between, two places were 2 hours and 20 minutes, then the difference in their longitudes would be 35°. The time difference between each longitude (each degree) is 4 minutes. So if it is 12 noon at Greenwich (0°), it would be 12:04 pm at 1° meridian and so on.

Solution:
A relief map is a type of map that shows the physical features and elevation of an area's surface. It uses shading, contour lines, and color to represent the topography of the land, including mountains, valleys, and other geographical features. Relief maps provide a visual representation of the three-dimensional characteristics of the Earth's surface on a two-dimensional map, allowing viewers to understand the terrain and elevation variations of a specific area. Therefore, the correct option is Option A: Relief Map.

Solution:
The local time at A is 4 pm, when Greenwich Mean Time is 2 p.m. This indicates that A is east of Greenwich and the longitude of A is 30°.

Solution:
Any circle that passes through two points that are opposite each other on a sphere. Many great circle can be drawn on a sphere.

Solution:
Gravitational force is maximum at Poles. The gravitational force is almost equal in every where in the earth. The resultant force is maximum in pole. Since earth is rotating there is centrifugal force and due to this force is maximum at poles.

Solution:
The boundary between the Earth's Crust and Mantle is referred to as Mohorovicic or simply Moho discontinuity. It lies 35 Km below continents & 7 Km beneath the ocean crust.