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10 reasons she is dry during sex
A geographical map of Africa, showing the ecological break that defines the Saharan area. An oasis in the Ahaggar Mountains. Oases support some life forms in extremely arid deserts. It is one of three distinct physiographic provinces of the African massive physiographic division. The highest peak in the Sahara is Emi Koussi , a shield volcano in the Tibesti range of northern Chad. The central Sahara is hyperarid , with sparse vegetation. The northern and southern reaches of the desert, along with the highlands, have areas of sparse grassland and desert shrub , with trees and taller shrubs in wadis , where moisture collects. In the central, hyperarid region, there are many subdivisions of the great desert: These extremely arid areas often receive no rain for years. To the north, the Sahara skirts the Mediterranean Sea in Egypt and portions of Libya, but in Cyrenaica and the Maghreb , the Sahara borders the Mediterranean forest, woodland, and scrub eco-regions of northern Africa, all of which have a Mediterranean climate characterized by hot summers and cool and rainy winters. According to the botanical criteria of Frank White  and geographer Robert Capot-Rey,   the northern limit of the Sahara corresponds to the northern limit of date palm cultivation and the southern limit of the range of esparto , a grass typical of the Mediterranean climate portion of the Maghreb and Iberia. The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha a drought-tolerant member of the Chenopodiaceae , or northern limit of Cenchrus biflorus , a grass typical of the Sahel. Climate The Sahara is the world's largest low-latitude hot desert. The area is located in the horse latitudes under the subtropical ridge , a significant belt of semi-permanent subtropical warm-core high pressure where the air from upper levels of the troposphere tends to sink towards the ground. This steady descending airflow causes a warming and a drying effect in the upper troposphere. The sinking air prevents evaporating water from rising and, therefore, prevents the adiabatic cooling, which makes cloud formation extremely difficult to nearly impossible. The stability of the atmosphere above the desert prevents any convective overturning, thus making rainfall virtually non-existent. As a consequence, the weather tends to be sunny, dry and stable with a minimal risk of rainfall. Subsiding, diverging, dry air masses associated with subtropical high-pressure systems are extremely unfavorable for the development of convectional showers. The lowering of air is the strongest and the most effective over the eastern part of the Great Desert, in the Libyan Desert which is the sunniest, driest and the most nearly "rain-less" place on the planet rivaling the Atacama Desert , lying in Chile and Peru. The rainfall inhibition and the dissipation of cloud cover are most accentuated over the eastern section of the Sahara rather than the western. The prevailing air mass lying above the Sahara is the continental tropical cT air mass, which is hot and dry. Hot, dry air masses primarily form over the North-African desert from the heating of the vast continental land area, and it affects the whole desert during most of the year. Because of this extreme heating process, a thermal low is usually noticed near the surface, and is the strongest and the most developed during the summertime. The Sahara High represents the eastern continental extension of the Azores High ,[ citation needed ] centered over the North Atlantic Ocean. The subsidence of the Sahara High nearly reaches the ground during the coolest part of the year while it is confined to the upper troposphere during the hottest periods. The effects of local surface low pressure are extremely limited because upper-level subsidence still continues to block any form of air ascent. Also, to be protected against rain-bearing weather systems by the atmospheric circulation itself, the desert is made even drier by his geographical configuration and location. Indeed, the extreme aridity of the Sahara can not be only explained by the subtropical high pressure. The Atlas Mountains , found in Algeria, Morocco and Tunisia also help to enhance the aridity of the northern part of the desert. These major mountain ranges act as a barrier causing a strong rain shadow effect on the leeward side by dropping much of the humidity brought by atmospheric disturbances along the polar front which affects the surrounding Mediterranean climates. The primary source of rain in the Sahara is the Intertropical Convergence Zone , a continuous belt of low-pressure systems near the equator which bring the brief, short and irregular rainy season to the Sahel and southern Sahara. Rainfall in this giant desert has to overcome the physical and atmospheric barriers that normally prevent the production of precipitation. The harsh climate of the Sahara is characterized by: The highest values are very close to the theoretical maximum value. The Sahara has a huge potential for solar energy production. Sahara desert The constantly high position of the sun, the extremely low relative humidity, and the lack of vegetation and rainfall make the Great Desert the hottest continuously large area worldwide, and the hottest place on Earth during summer in some spots. Salah, well known in Algeria for its extreme heat, has average high temperatures of There are even hotter spots in the Sahara, but they are located in extremely remote areas, especially in the Azalai , lying in northern Mali. Some examples of this are: Bilma , Niger and Faya-Largeau, Chad. Sand and ground temperatures are even more extreme. However, it is a myth that the nights are cold after extremely hot days in the Sahara. Still, it is true that winter nights can be cold as it can drop to the freezing point and even below, especially in high-elevation areas. The frequency of subfreezing winter nights in the Sahara is strongly influenced by the North Atlantic Oscillation NAO , with warmer winter temperatures during negative NAO events and cooler winters with more frosts when the NAO is positive. For example, Biskra , Algeria and Ouarzazate , Morocco are found in this zone. For example, Timbuktu, Mali and Agadez , Niger are found in this zone. The vast central hyper-arid core of the desert is virtually never affected by northerly or southerly atmospheric disturbances and permanently remains under the influence of the strongest anticyclonic weather regime, and the annual average rainfall can drop to less than 1 millimetre 0. In fact, most of the Sahara receives less than 20 millimetres 0. However, at least two instances of snowfall have been recorded in Sahara, in February and December , both in the town of Ain Sefra. Sahara pump theory , Green Sahara , Prehistoric North Africa , and North African climate cycles The climate of the Sahara has undergone enormous variations between wet and dry over the last few hundred thousand years,  believed to be caused by long-term changes in the North African climate cycle that alters the path of the North African Monsoon - usually southward. When the North African monsoon is at its strongest annual precipitation and subsequent vegetation in the Sahara region increase, resulting in conditions commonly referred to as the " green Sahara ". For a relatively weak North African monsoon, the opposite is true, with decreased annual precipitation and less vegetation resulting in a phase of the Sahara climate cycle known as the "desert Sahara". Kutzbach never formally named his hypothesis and as such it is referred to here as the "Orbital Monsoon Hypothesis" as suggested by Ruddiman in In the southern Sahara, the drying trend was initially counteracted by the monsoon , which brought rain further north than it does today. By around BC, however, the monsoon retreated south to approximately where it is today,  leading to the gradual desertification of the Sahara. During periods of a wet or " Green Sahara ", the Sahara becomes a savanna grassland and various flora and fauna become more common. Following inter-pluvial arid periods, the Sahara area then reverts to desert conditions and the flora and fauna are forced to retreat northwards to the Atlas Mountains , southwards into West Africa , or eastwards into the Nile Valley. This separates populations of some of the species in areas with different climates , forcing them to adapt , possibly giving rise to allopatric speciation. It is also proposed that humans accelerated the drying out period from 6,—2, BC by pastoralists overgrazing available grassland. The Red Sea coastal route was extremely arid before and after kya. Slightly wetter conditions appear at 90—87 kya, but it still was just one tenth the rainfall around kya. This suggests that the southern Negev was arid to hyper-arid in these periods. This is a climate cell which causes rising tropical air of the Inter-Tropical Convergence Zone ITCZ to bring rain to the tropics, while dry descending air, at about 20 degrees north , flows back to the equator and brings desert conditions to this region. It is associated with high rates of wind-blown mineral dust, and these dust levels are found as expected in marine cores from the north tropical Atlantic. The moister Saharan conditions had begun about 12, BC, with the extension of the ITCZ northward in the northern hemisphere summer, bringing moist wet conditions and a savanna climate to the Sahara, which apart from a short dry spell associated with the Younger Dryas peaked during the Holocene thermal maximum climatic phase at BC when mid-latitude temperatures seem to have been between 2 and 3 degrees warmer than in the recent past. Analysis of Nile River deposited sediments in the delta also shows this period had a higher proportion of sediments coming from the Blue Nile , suggesting higher rainfall also in the Ethiopian Highlands. This was caused principally by a stronger monsoonal circulation throughout the sub-tropical regions, affecting India, Arabia and the Sahara. This is linked to a marked decline in the scale of the Nile floods between and BC. The Sahara comprises several distinct ecoregions. With their variations in temperature, rainfall, elevation, and soil, these regions harbor distinct communities of plants and animals. The Atlantic coastal desert is a narrow strip along the Atlantic coast where fog generated offshore by the cool Canary Current provides sufficient moisture to sustain a variety of lichens , succulents , and shrubs. Winter rains sustain shrublands and dry woodlands that form a transition between the Mediterranean climate regions to the north and the hyper-arid Sahara proper to the south. Vegetation is rare, and this ecoregion consists mostly of sand dunes erg, chech, raoui , stone plateaus hamadas , gravel plains reg , dry valleys wadis , and salt flats. These rains sustain summer pastures of grasses and herbs, with dry woodlands and shrublands along seasonal watercourses. Higher and more regular rainfall and cooler temperatures support woodlands and shrublands of Date palm, acacias , myrtle , oleander , tamarix , and several rare and endemic plants. It is along the borders of Algeria, Niger]] and Mali, west of the Hoggar mountains. Flora and fauna The flora of the Sahara is highly diversified based on the bio-geographical characteristics of this vast desert. Floristically , the Sahara has three zones based on the amount of rainfall received — the Northern Mediterranean , Central and Southern Zones. There are two transitional zones — the Mediterranean-Sahara transition and the Sahel transition zone. Approximately a quarter of these are endemic. About half of these species are common to the flora of the Arabian deserts. Plants such as acacia trees, palms, succulents, spiny shrubs, and grasses have adapted to the arid conditions, by growing lower to avoid water loss by strong winds, by storing water in their thick stems to use it in dry periods, by having long roots that travel horizontally to reach the maximum area of water and to find any surface moisture, and by having small thick leaves or needles to prevent water loss by evapotranspiration. Plant leaves may dry out totally and then recover. Camels in the Guelta d'Archei , in north-eastern Chad. Several species of fox live in the Sahara including: The addax , a large white antelope , can go nearly a year in the desert without drinking. The dorcas gazelle is a north African gazelle that can also go for a long time without water. Other notable gazelles include the rhim gazelle and dama gazelle. There remain fewer than mature cheetahs, which are very cautious, fleeing any human presence. The cheetah avoids the sun from April to October, seeking the shelter of shrubs such as balanites and acacias. They are unusually pale. However, it is currently extinct in the wild in Egypt and Libya. There are approximately mature individuals left in the wild. Other animals include the monitor lizards , hyrax , sand vipers , and small populations of African wild dog ,  in perhaps only 14 countries  and red-necked ostrich. Other animals exist in the Sahara birds in particular such as African silverbill and black-faced firefinch , among others. There are also small desert crocodiles in Mauritania and the Ennedi Plateau of Chad. Its venom contains large amounts of agitoxin and scyllatoxin and is very dangerous; however, a sting from this scorpion rarely kills a healthy adult. The Saharan silver ant is unique in that due to the extreme high temperatures of their habitat, and the threat of predators, the ants are active outside their nest for only about ten minutes per day.
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