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Harrat Rahat
Ḥarrat Rahāṭ ( ar, حَرَّة رَهَاط) is a volcanic lava field in the Hejazi region of Saudi Arabia. In 1256 CE, a lava flow erupted from six aligned scoria cones, and traveled to within of the Holiest sites in Islam, Islamic holy city of Medina; this was its last eruption. There were earlier eruptions, such as in 641 CE, which made finger-like flows to the east of the 1256 CE flow. It is the biggest lava field in Saudi Arabia. Nearby is Al Wahbah crater. There has been recent increase in seismic activitiy since 2009. See also * List of volcanoes in Saudi Arabia * Sarawat Mountains, Sarat Mountains ** Hijaz Mountains External linksYoutube video: The Active Volcano in Saudi Arabia; Harrat Rahat References Volcanoes of Saudi Arabia Lava fields Holocene volcanoes Hejaz ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hejaz
The Hejaz (, also ; ar, ٱلْحِجَاز, al-Ḥijāz, lit=the Barrier, ) is a region in the west of Saudi Arabia. It includes the cities of Mecca, Medina, Jeddah, Tabuk, Yanbu, Taif, and Baljurashi. It is also known as the "Western Province" in Saudi Arabia.Mackey, p. 101. "The Western Province, or the Hejaz .. It is bordered in the west by the Red Sea, in the north by Jordan, in the east by the Najd, and in the south by the 'Asir Region. Its largest city is Jeddah (the second largest city in Saudi Arabia), with Mecca and Medina being the fourth and fifth largest cities respectively in the country. The Hejaz is the most cosmopolitan region in the Arabian Peninsula. The Hejaz is significant for being the location of the Islamic holy cities of Mecca and Medina, the first and second holiest sites in Islam, respectively. As the site of the two holiest sites in Islam, the Hejaz has significance in the Arab and Islamic historical and political landscape. The region of Hejaz is ... [...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] |
Volcanic Field
A volcanic field is an area of Earth's crust that is prone to localized volcanic activity. The type and number of volcanoes required to be called a "field" is not well-defined. Volcanic fields usually consist of clusters of up to 100 volcanoes such as cinder cones. Lava flows may also occur. They may occur as a monogenetic volcanic field or a polygenetic volcanic field. Description Alexander von Humboldt observed in 1823 that geologically young volcanoes are not distributed uniformly across the Earth's surface, but tend to be clustered into specific regions. Young volcanoes are rarely found within cratons, but are characteristic of subduction zones, rift zones, or in ocean basins. Intraplate volcanoes are clustered along hotspot traces. Within regions of volcanic activity, volcanic fields are clusters of volcanoes that share a common magma source. Scoria cones are particularly prone to cluster into volcanic fields, which are typically in diameter and consist of several tens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava Field
Lava fields are large, mostly flat areas of surface or subaquatic lava flows. Such features are generally composed of highly fluid basalt lava, and can extend for tens or hundreds of miles across the underlying terrain. Morphology and structure The final morphology of a lava field can reveal properties such as internal structure, composition, and mechanics of the lava flow when it was fluid. The ridges and patterns on top of the lava field show the direction of the channels and the oftentimes active lava tubes that may be underneath the solidified "crust." It can also reveal whether the lava flow can be classified as pāhoehoe or 'a'ā. The two main types of lava field structures are defined as sheet flow lava and pillow lava. Sheet flow lava appears like a wrinkled or folded sheet, while pillow lava is bulbous, and often looks like a pile of pillows atop one another. An important aspect of lava flow morphology is a phenomenon known as lava flow inflation. This occurs in p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava
Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from . The volcanic rock resulting from subsequent cooling is also often called ''lava''. A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.) The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. The word ''lava'' comes from Italian and is probably derived from the Latin word ''labes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scoria
Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock that was ejected from a volcano as a molten blob and cooled in the air to form discrete grains or clasts.Neuendorf, K.K.E., J.P. Mehl, Jr., and J.A. Jackson, eds. (2005) ''Glossary of Geology'' (5th ed.). Alexandria, Virginia, American Geological Institute. 779 pp. It is typically dark in color (generally dark brown, black or purplish-red), and basaltic or andesitic in composition. Scoria is relatively low in density as a result of its numerous macroscopic ellipsoidal vesicles, but in contrast to pumice, all scoria has a specific gravity greater than 1, and sinks in water. The holes or vesicles form when gases that were dissolved in the magma come out of solution as it erupts, creating bubbles in the molten rock, some of which are frozen in place as the rock cools and solidifies. Scoria may form as part of a lava flow, typically near its surface, or as fragmental ejecta (lapilli, blocks and bombs), for inst ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holiest Sites In Islam
The holiest sites in Islam are predominantly located in Western Asia. While the significance of most places typically varies depending on the Islamic sect, there is a consensus across all mainstream branches of the religion that affirms three cities as having the highest degree of holiness, in descending order: Mecca, Medina, and Jerusalem. Mecca's al-Masjid al-Haram (including the Kaaba), Medina's al-Masjid an-Nabawi, and Jerusalem's Temple Mount (including al-Aqsa Mosque) are all revered by Muslims as sites of great importance. Both the Umayyad Mosque in the city of Damascus and the Ibrahimi Mosque in the city of Hebron have held interchangeable significance as the fourth-holiest Islamic sites. After the consensus on the first four sites as well as further sites associated with the family of Muhammad, there is a divergence between Sunni Muslims and Shia Muslims on the designation of additional holy sites. For Sunnis, sites associated with the companions of Muhammad, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medina
Medina,, ', "the radiant city"; or , ', (), "the city" officially Al Madinah Al Munawwarah (, , Turkish: Medine-i Münevvere) and also commonly simplified as Madīnah or Madinah (, ), is the Holiest sites in Islam, second-holiest city in Islam, and the capital of the Medina Province (Saudi Arabia), Medina Province of Saudi Arabia. , the estimated population of the city is 1,488,782, making it the List of cities and towns in Saudi Arabia, fourth-most populous city in the country. Located at the core of the Medina Province in the western reaches of the country, the city is distributed over , of which constitutes the city's urban area, while the rest is occupied by the Hijaz Mountains, Hejaz Mountains, empty valleys, Agriculture in Saudi Arabia, agricultural spaces and older dormant volcanoes. Medina is generally considered to be the "cradle of Islamic culture and civilization". The city is considered to be the second-holiest of three key cities in Islamic tradition, with Mecca and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eruption
Several types of volcanic eruptions—during which lava, tephra (ash, lapilli, volcanic bombs and volcanic blocks), and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series. There are three different types of eruptions: * Magmatic eruptions are the most well-observed type of eruption. They involve the decompression of gas within magma that propels it forward. * Phreatic eruptions are driven by the superheating of steam due to the close proximity of magma. This type exhibits no magmatic release, instead causing the granulation of existing rock. * Phreatomagmatic eruptions are driven by the direct interaction of magma and water, as opposed to phreatic erupti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Al Wahbah Crater
Al Wahbah Crater ( ar, فَوْهَة ٱلْوَعْبَة, Fawhat al-Waʿbah), also ''Maqlaʿ Ṭamiyyah'' (), is a volcanic crater, which is about away from Ta'if on the western edge of the Harrat Kishb basalt plateau in the Hejazi region of Saudi Arabia (lat. 22.90632, lon. 41.13849). The Harrat Kishb plateau contains many volcanic cones. It is deep and in diameter. The bottom of the crater is covered with white sodium phosphate crystals. Origins While it was thought for some time that the crater was formed by a meteorite, as its appearance resembles that of the Barringer Crater, with its circular form and high sides, it is now commonly accepted by geologists that the crater is a maar crater, and was formed by volcanic activity in the form of an underground phreatic eruption – a massive steam explosion generated by molten basaltic magma coming into contact with subterranean water. Vegetation The remains of date palm plantations can be found halfway down the side of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Volcanoes In Saudi Arabia ...
This is a partial list of active and extinct volcanoes in Saudi Arabia. References {{Asia topic, state=uncollapsed, List of volcanoes in Saudi Arabia Volcanoes A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sarawat Mountains
The Sarawat Mountains ( ar, جِبَالُ ٱلسَّرَوَاتِ, Jibāl as-Sarawāt), also known as the Sarat, is a part of the Hijaz mountains in the western part of the Arabian Peninsula. In a broad sense, it runs parallel to the eastern coast of the Red Sea, and thus encompasses the mountains of Fifa', 'Asir and Taif (which can be seen as including the Midian Mountains). In a narrow sense, the Sarawat start in Taif city in Saudi Arabia, and extend to the Gulf of Aden in the south, running along the entire western coast of Yemen, in what used to be North Yemen, and extend eastwards into part of what used to be South Yemen, thus running parallel to the Gulf of Aden. Geology These mountains are mainly rocky though some contain vegetation. Many of the peaks are fairly young and jagged, but some are smoother from weathering. Nearing the Yemeni border, the Sarawat begin to spread into individual peaks, and the Hejaz turns from a cliff to a gradual ascent up to the Yemeni Pl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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