Excessive sun exposure is a common cause of brown spots on the scalp due to conditions such as melasma and actinic keratosis, per the Mayo Clinic and the American Academy of Dermatology. While these conditions differ slightly from each other, they both are frequently caused by excessive ultraviolet radiation. Continue Reading.
Mexico is a part of North America. Maybe you are thinking of Northern America, which is a tricky area as sometimes Mexico is included and sometimes it is not. Northern America â¦ is the northern portion of North America, in which Canada and the United States are usually the two sole members.
Located in the continent of North America, Mexico covers 1,943,945 square kilometers of land and 20,430 square kilometers of water, making it the 14th largest nation in the world with a total area of 1,964,375 square kilometers. Mexico became an independent state in 1821, after gaining its sovereignty from Spain.