People are starving, because resources they need and used to have are gone. At repeated intervals throughout Earths history, theres been more energy pouring in from the sun during the West African monsoon season, and during those timesknown as African Humid Periodsmuch more rain comes down over north Africa. A desert tortoises thick shell insulates the animal and reduces water loss. Rains wash many of these valuable nutrients from the soil into the Amazon river basin, making the nutrient delivery from Africa important for maintaining healthy vegetation. Human Environmental Interaction: Because dry lands take up 40 percent of the worlds land area, desertification is a global issue that affects almost all continents, especially Africa. Some AHPs, such as the one during the last interglacial (Eemian AHP, 128,000-122,000 years BP), experienced an increase in rainfall across northern Africa and the Arabian Peninsula, sufficient to establish a continuous "vegetated corridor" across today's hyperarid Sahara region 34, 35, 36, 62, 64 . A nonprofit group, Carbon Mapper, will use data from NASAs EMIT mission, plus current airborne and future satellite instruments, to survey waste sites for methane emissions. Humans can also have a positive impact by preventing any further damage. Within a few years of use, all the nutrients in the soil are used up, meaning that crops can no longer be grown. Astrowright. Minerals like iron and phosphorus in the dust act as a fertilizer for the Amazon rainforest, Earths largest and most biodiverse tropical forest. It is one of the major hot deserts of the world with the highest population density. These windbreaks anchor the soil and prevent sand from invading populated areas.In Chinas Tengger Desert, researchers have developed another way to control wandering dunes. Between 1958 and 1971, the government of Egypt constructed a massive dam on the Upper Nile (the southern part of the river, near Egypts border with Sudan). Winds at speeds of about 100 kilometers per hour (60 miles per hour) sweep through some deserts. The peak of Saharan dust transport to the eastern side of the Americas took place roughly between 12,000 to 17,000 years ago, at the end of the last Ice Age. By the time air masses from coastal areas reach the interior, they have lost all their moisture. One-third of Africas drylands are largely uninhabited arid deserts, while the remaining two-thirds support two-thirds of the continents burgeoning human population. These spinning columns of dirt can rise hundreds of feet in the air. See examples of primary, secondary, and tertiary consumers in the desert. The Sahara Desert is 3,600,000 square miles (9,200,000 square kilometers) of arid land stretched across the northern half of Africa, coming in just slightly smaller in size than the continental United States. There are no second chances, so the long-term viability of 35% of humanity rests on maintaining the landscapes where they live. However, some birds, such as the roadrunner, have adapted to life in the desert. How does climate affect chemical weathering? As thats happening, the West African monsoon is going to get a little bit weaker. Some one-fifth of the irrigated cropland, three-fifths of the rain-fed cropland, and three-fourths of the rangeland have been at least moderately harmed by desertification.
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