difine the following a (a axis (b grid (c prime meridaian
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An axis is an invisible line around which an object rotates, or spins. The points where an axis intersects with an object's surface are the object's North and South Poles. In this illustration, Earth's axis is represented by the red line. The white circle represents axial precession, the slow "wobble" of the axis.
A grid is a network of evenly spaced horizontal and vertical lines used to identify locations on a map. For example, you can place a grid that divides a map into a specified number of rows and columns by choosing the reference grid type.
A prime meridian is the meridian in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian form a great circle. This great circle divides a spheroid into two hemispheres.