Our planet, Earth appears blue due to the mass amounts of water and lacks on its surface.
Try taking a clearer picture or just type question 13c because i don't know what it is.
<span>A topographic map is the best tool for this purpose.
In addition to being used for directional navigation, topographic maps also give the user a means by which to understand elevation in the area they climbing. These maps include topographic lines where each line represents an elevation and the distance between lines can be used to determine the terrain profile.</span>
