Abrasion is caused by the effects of wind and sand.
You didn't put any answer choices but it's to stop the ozone layer from going away.
The maps outlining borders and capitals is a political map. These maps are really useful in geopolitics.
Hope this helps
Answer: 360°
Explanation;
Lines of longitude are imaginary lines that used along with latitudes allow us to be able to locate points on Earth. Longitudes are drawn vertically on maps with the most popular one being the Prime( Greenwich) meridian.
As the Earth is spherical, the lines of longitude encircle the Earth which means that an entire longitudinal line will be 360°. As maps are flattened out, the longitudinal line is divided into 2 such that the longitudinal lines seen on a map are 180° each. When a line of longitude is added to its opposite, they will reform the original line that runs around the earth thereby making 360°.
The Nile River, The amazon river, the Yangtze River, The Mississippi river/ Missouri River, <span>The Yenisei/Angara/Selenga River</span>