Dead trees on Deadvlei Pan, Namibia
photo by Eric Bézine1 967
The Namib-Naukluft National Park is a national park of Namibia encompassing part of the Namib Desert (considered the world's oldest desert) and the Naukluft mountain range. With an overall area of 49,768 km2 (19,216 sq mi), the Namib-Naukluft is the largest game park in Africa and the fourth largest in the world. The most well-known area of the park is Sossusvlei, which is the main visitor attraction in Namibia.
A surprising collection of creatures survives in the hyper-arid region, including snakes, geckos, unusual insects, hyenas, gemsboks and jackals. More moisture comes in as a fog off the Atlantic Ocean than falls as rain, with the average 106 millimeters of rainfall per year concentrated in the months of February and April.
The winds that bring in the fog are also responsible for creating the park’s towering sand dunes, whose burnt orange color is a sign of their age. The orange color develops over time as iron in the sand is oxidized, like rusty metal; the older the dune, the brighter the color.
These dunes are the tallest in the world, in places rising more than 300 meters (almost 1000 feet) above the desert floor. The dunes taper off near the coast, and lagoons, wetlands, and mudflats located along the shore attract hundreds of thousands of birds.
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Namibia, officially the Republic of Namibia (Afrikaans: Republiek van Namibië, German: Republik Namibia (help·info)), is a country in southern Africa whose western border is the Atlantic Ocean. It shares land borders with Angola and Zambia to the north, Botswana to the east and South Africa to the south and east. Although it does not border with Zimbabwe, less than 200 meters of riverbed (essentially the Zambia/Botswana border) separates them at their closest points. It gained independence from South Africa on 21 March 1990, following the Namibian War of Independence. Its capital and largest city is Windhoek. Namibia is a member state of the United Nations (UN), the Southern African Development Community (SADC), the African Union (AU), and the Commonwealth of Nations.
The dry lands of Namibia were inhabited since early times by Bushmen, Damara, and Namaqua, and since about the 14th century AD by immigrating Bantu who came with the Bantu expansion. It became a German Imperial protectorate in 1884 and remained a German colony until the end of World War I. In 1920, the League of Nations mandated the country to South Africa, which imposed its laws and, from 1948, its apartheid policy.
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Desertification is a type of land degradation in which a relatively dry land region becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. It is caused by a variety of factors, such as climate change and human activities[citation needed]. Desertification is a significant global ecological and environmental problem.
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In botany, a tree is a plant with an elongated stem, or trunk, supporting leaves or branches.
In some usages, the definition of a tree may be narrower, including only woody plants, only plants that are usable as lumber, only plants above a specified height or only perennial species. At its broadest, trees include the taller palms, the tree ferns, bananas and bamboo.
A tree typically has many secondary branches supported clear of the ground by the trunk. This trunk typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees it is surrounded by a layer of bark which serves as a protective barrier. Below the ground, the roots branch and spread out widely; they serve to anchor the tree and extract moisture and nutrients from the soil. Above ground, the branches divide into smaller branches and shoots. The shoots typically bear leaves, which capture light energy and convert it into chemical energy by photosynthesis, providing the food needed by the tree for its growth and development.
Flowers and fruit may also be present, but some trees such as conifers instead have pollen cones and seed cones, and others such as tree ferns produce spores instead.
Trees tend to be long-lived, some reaching several thousand years old. The tallest known specimen on Earth is 115.6 m (379 ft) and they have a theoretical maximum height of 130 m (426 ft). Trees have been in existence on the Earth for 370 million years. Trees are not a taxonomic group but are a number of plant species that have independently evolved a woody trunk and branches as a way to tower above other plants and make full use of the sunlight.
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