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.
There are 5 original Central American countries Guatemala, El Salvador, Honduras, Nicaragua and Costa Rica. Mexico was always considered a part of North America. The Mexican people that I know agree that they are part of North America, geographically.fter checking my stats using Google Analytics a few weeks ago, I noticed that Google included Mexico as part of Central America. I thought it odd, because I was taught Mexico was part of North America (as a Google Images search seems to confirm). After all, the NAFTA does include Mexico.