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Ein Heet Cave
Ein Heet Cave is a natural cave which is located 30 kilometers southeast of Riyadh city, near Alkharj, Saudi Arabia. Description Ein Heet is a solutional cave that is famous for its limestone formations, and natural water reservoir. It is located in Al-Jubail Mountain, about 40 kilometers from Riyadh in the Kingdom of Saudi Arabia. It is a known tourist site, and one of Saudi Arabia's caves with easy access. Inside the cave, there is an underground lake in internal circled holes of more than 30 meters deep and 150 meters long. In the past, the water level was high, and the convoys were supplying water from it. However, the water level has declined in recent times. The cave consists of numerous sinkholes (land subsidence). These sinkholes serve as an entrance to a large groundwater reservoir that is situated under the surface at great depth. It is the site of a star pin dating back thousands of years. The cave is distinguished by the coldness of water and atmosphere due to its ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Sovereign States
The following is a list providing an overview of sovereign states around the world with information on their status and recognition of their sovereignty. The 206 listed states can be divided into three categories based on membership within the United Nations System: 193 UN member states, 2 UN General Assembly non-member observer states, and 11 other states. The ''sovereignty dispute'' column indicates states having undisputed sovereignty (188 states, of which there are 187 UN member states and 1 UN General Assembly non-member observer state), states having disputed sovereignty (16 states, of which there are 6 UN member states, 1 UN General Assembly non-member observer state, and 9 de facto states), and states having a special political status (2 states, both in free association with New Zealand). Compiling a list such as this can be a complicated and controversial process, as there is no definition that is binding on all the members of the community of nations concerni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flag Of Saudi Arabia
The flag of the Kingdom of Saudi Arabia ( ar, علم المملكة العربية السعودية) is the flag used by the government of Saudi Arabia since 15 March 1973. It is a green flag featuring in white an Arabic inscription and a sword. The inscription is the Islamic creed, or ''shahada'': "There is no deity but God; Muhammad is the Messenger of God". Design The Arabic inscription on the flag, written in the calligraphic Thuluth script, is the ''shahada'' or Islamic declaration of faith: : : ' :''"There is no deity but God; Muhammad is the Messenger of God."'' The green of the flag represents Islam and the sword stands for the strictness in applying justice. The flag is manufactured with identical obverse and reverse sides, to ensure the ''shahada'' reads correctly, from right to left, from either side. The sword also points to the left on both sides, in the direction of the script. The flag is sinister hoisted, meaning that when viewed from the obverse (front) side, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saudi Arabia
Saudi Arabia, officially the Kingdom of Saudi Arabia (KSA), is a country in Western Asia. It covers the bulk of the Arabian Peninsula, and has a land area of about , making it the fifth-largest country in Asia, the second-largest in the Arab world, and the largest in Western Asia and the Middle East. It is bordered by the Red Sea to the west; Jordan, Iraq, and Kuwait to the north; the Persian Gulf, Qatar and the United Arab Emirates to the east; Oman to the southeast; and Yemen to the south. Bahrain is an island country off the east coast. The Gulf of Aqaba in the northwest separates Saudi Arabia from Egypt. Saudi Arabia is the only country with a coastline along both the Red Sea and the Persian Gulf, and most of its terrain consists of arid desert, lowland, steppe, and mountains. Its capital and largest city is Riyadh. The country is home to Mecca and Medina, the two holiest cities in Islam. Pre-Islamic Arabia, the territory that constitutes modern-day Saudi Ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural
Nature, in the broadest sense, is the physical world or universe. "Nature" can refer to the phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. Although humans are part of nature, human activity is often understood as a separate category from other natural phenomena. The word ''nature'' is borrowed from the Old French ''nature'' and is derived from the Latin word ''natura'', or "essential qualities, innate disposition", and in ancient times, literally meant "birth". In ancient philosophy, ''natura'' is mostly used as the Latin translation of the Greek word ''physis'' (φύσις), which originally related to the intrinsic characteristics of plants, animals, and other features of the world to develop of their own accord. The concept of nature as a whole, the physical universe, is one of several expansions of the original notion; it began with certain core applications of the word φύσις by pre-Socr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave
A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea caves, rock shelters, and grottos, that extend a relatively short distance into the rock and they are called ''exogene'' caves. Caves which extend further underground than the opening is wide are called ''endogene'' caves. Speleology is the science of exploration and study of all aspects of caves and the cave environment. Visiting or exploring caves for recreation may be called ''caving'', ''potholing'', or ''spelunking''. Formation types The formation and development of caves is known as ''speleogenesis''; it can occur over the course of millions of years. Caves can range widely in size, and are formed by various geological processes. These may involve a combination of chemical processes, erosion by water, tectonic forces, microorgani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riyadh
Riyadh (, ar, الرياض, 'ar-Riyāḍ, lit.: 'The Gardens' Najdi pronunciation: ), formerly known as Hajr al-Yamamah, is the capital and largest city of Saudi Arabia. It is also the capital of the Riyadh Province and the centre of the Riyadh Governorate. It is the largest city on the Arabian Peninsula, and is situated in the center of the an-Nafud desert, on the eastern part of the Najd plateau. The city sits at an average of above sea level, and receives around 5 million tourists each year, making it the forty-ninth most visited city in the world and the 6th in the Middle East. Riyadh had a population of 7.6 million people in 2019, making it the most-populous city in Saudi Arabia, 3rd most populous in the Middle East, and 38th most populous in Asia. The first mentioning of the city by the name ''Riyadh'' was in 1590, by an early Arab chronicler. In 1737, Deham Ibn Dawwas, who was from the neighboring Manfuha, settled in and took control of the city. Deham built a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Al-Kharj
Kharj ( ar, الخرج) is a governorate in central Saudi Arabia. It is one of the important governorates in the Kingdom of Saudi Arabia and is located in the southeast of the capital Riyadh, within an area of 19,790 km2 ~ 4,890,215.5 acres, and a population of 376,325 people, according to the statistics of the General Authority for Statistics for the year 2010. The city of Al Saih ( ar, السيح) is the capital of modern Kharj and its administrative and economic center. Etymology ) and are reserved by the sands of Aldahna ( ar, الدهنـاء)., date=September 2020 It has also been said that Alkharj means what comes out of the earth because it is an agricultural region since the earliest times, and the name is older than those poets like the poet of King Al-Himyari ( ar, الملك الحميري), Asaad Abi Karb Al-Awsat ( ar, أسعد أبي كرب الأوسط), who mentioned the name of the Alkharj in their poems. The Ministry of Transport recently started making so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solutional Cave
A solutional cave, solution cave, or karst cave is a cave usually formed in the soluble rock limestone. It is the most frequently occurring type of cave. It can also form in other rocks, including chalk, dolomite, marble, salt beds, and gypsum. Process Bedrock is dissolved by natural acid in groundwater that seeps through bedding-planes, faults, joints and so on. Over geological epochs these openings expand as the walls are dissolved to become caves or cave systems. The portions of a solutional cave that are below the water table or the local level of the groundwater will be flooded. Limestone caves The largest and most abundant solutional caves are located in limestone. Limestone caves are often adorned with calcium carbonate formations produced through slow precipitation. These include flowstones, stalactites, stalagmites, helictites, soda straws, calcite rafts and columns. These secondary mineral deposits in caves are called ''speleothems''. Carbonic acid dissoluti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Groundwater
Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the water table. Groundwater is recharged from the surface; it may discharge from the surface naturally at springs and seeps, and can form oases or wetlands. Groundwater is also often withdrawn for agricultural, municipal, and industrial use by constructing and operating extraction wells. The study of the distribution and movement of groundwater is hydrogeology, also called groundwater hydrology. Typically, groundwater is thought of as water flowing through shallow aquifers, but, in the technical sense, it can also contain soil moisture, perma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologists
A geologist is a scientist who studies the solid, liquid, and gaseous matter that constitutes Earth and other terrestrial planets, as well as the processes that shape them. Geologists usually study geology, earth science, or geophysics, although backgrounds in physics, chemistry, biology, and other sciences are also useful. Field research (field work) is an important component of geology, although many subdisciplines incorporate laboratory and digitalized work. Geologists can be classified in a larger group of scientists, called geoscientists. Geologists work in the energy and mining sectors searching for natural resources such as petroleum, natural gas, precious and base metals. They are also in the forefront of preventing and mitigating damage from natural hazards and disasters such as earthquakes, volcanoes, tsunamis and landslides. Their studies are used to warn the general public of the occurrence of these events. Geologists are also important contributors to climate chan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibn Said
Abū al-Ḥasan ʿAlī ibn Mūsā ibn Saʿīd al-Maghribī ( ar, علي بن موسى المغربي بن سعيد) (1213–1286), also known as Ibn Saʿīd al-Andalusī, was an Arab geographer, historian, poet, and the most important collector of poetry from al-Andalus in the 12th and 13th centuries. Biography Ibn Said was born at Alcalá la Real near Granada to a prominent family which was descended from the Companion of the Prophet Ammar ibn Yasir. Many of his family members were literary figures, and grew up in Marrakesh. He subsequently studied in Seville and stayed in Tunis, Alexandria, Cairo, Jerusalem and Aleppo. At the age of 30, he undertook a pilgrimage to Mecca. He was also a close friend of the Muwallad poet Ibn Mokond Al-Lishboni (of Lisbon). His last years were spent in Tunis, and he died there in 1286. Writings Ibn Said al-Maghribi wrote or compiled 'at least forty works on various branches of knowledge'. Ibn Said's best known achievement was the completion of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meters
The metre (British spelling) or meter (American spelling; see spelling differences) (from the French unit , from the Greek noun , "measure"), symbol m, is the primary unit of length in the International System of Units (SI), though its prefixed forms are also used relatively frequently. The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately km. In 1799, the metre was redefined in terms of a prototype metre bar (the actual bar used was changed in 1889). In 1960, the metre was redefined in terms of a certain number of wavelengths of a certain emission line of krypton-86. The current definition was adopted in 1983 and modified slightly in 2002 to clarify that the metre is a measure of proper length. From 1983 until 2019, the metre was formally defined as the length of the path travelled by light in a vacuum in of a second. After the 2019 redefiniti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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