Today the breakthrough product for genealogists and adoptees is autosomal DNA testing. Both men and women are using this type of test to identify previously unknown relatives in their family trees and learn more about their ethnicity. One test even provides genetic health information.n addition to testing the autosomal chromosomes, 23andMe also checks some data from the X and Y (for men) chromosomes and a portion of your mitochondrial DNA. That lets them predict your maternal line haplogroup andâif you are a manâyour paternal line haplogroup.
Drought Defined. A drought is a period of drier-than-normal conditions that results in water-related problems. When rainfall is less than normal for several weeks, months, or years, the flow of streams and rivers declines, water levels in lakes and reservoirs fall, and the depth to water in wells increases.
Because drought is defined as a deficit in water supply, it can be caused by a number of factors. The most important one though relates to the amount of water vapor in the atmosphere as this is what creates precipitation. More rain, sleet, hail, and snow can occur where there are moist, low pressure air systems. 1  If there is an above average presence of dry, high pressure air systems instead, less moisture is available to produce precipitation (because these systems cannot hold as much water vapor).