Topographic maps represent an area's physical features by describing

A. shape, elevation, and steepness of features

Explanation:

The topological maps of the given area show us the type of terrain and the nature of the landmass and which can be highlighted by the steepness and the shape of the geologic features and the there elevation above he geographic mean sea levels also.  Thus provide us with the adequate information on their formation and thus are special characters of the map. Thus the toposheets becomes an important tool for the geographer when analysing the terrain and modeling of the earth landscape and there detailed quantitative representation of the earth is produced by the scientific triangulation of the earth's feature and the height are shows by the connecting the lines that mark the contour intervals and their applicability in civil engineering and mountaineering also.

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.

Answer feldspar,quartz,mica and amphibole;