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The Canadian Shield, also called the Laurentian Plateau, is a geologic shield, a large area of exposed Precambrian igneous and high-grade metamorphic rocks. It forms the North American Craton, the ancient geologic core of the North American continent. Glaciation has left the area with only a thin layer of soil, through which exposures of igneous bedrock resulting from its long volcanic history are frequently visible. As a deep, common, joined bedrock region in eastern and central Canada, the Shield stretches north from the Great Lakes to the Arctic Ocean, covering over half of Canada and most of Greenland; it also extends south into the northern reaches of the United States. Human population is sparse and industrial development is minimal, but mining is prevalent.
A caldera is a large cauldron-like hollow that forms shortly after the emptying of a magma chamber in a volcanic eruption. When large volumes of magma are erupted over a short time, structural support for the rock above the magma chamber is lost. The ground surface then collapses into the emptied or partially emptied magma chamber, leaving a large depression at the surface. Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence and collapse rather than an explosion or impact. Compared to the thousands of volcanic eruptions that occur each century, the formation of a caldera is a rare event, occurring only a few times per century. Only seven caldera-forming collapses are known to have occurred between 1911 and 2016. More recently, a caldera collapse occurred at Kīlauea, Hawaii in 2018.
Ḥaʼil Province, also known as the Ha'il Region, is one of the 13 provinces of the Kingdom of Saudi Arabia. It is the eighth-largest province by area at 103,887 km2 (40,111 sq mi) and the ninth-largest by population, with the population in 2019 being 731,147. The province accounts for roughly 2% of the population of the country and is named for its largest city, Ha'il. Other populous cities in the province include al-Ghazalah, Shinan and Baq'aa. The region is famous for the twin mountain ranges of 'Aja and Salma, and for being the homeland of historic symbol of curiosity and generosity, Hatim al-Ta`i.
Tweed Volcano is a partially eroded Early Miocene shield volcano located in northeastern New South Wales, which formed when this region of Australia passed over the East Australia hotspot around 23 million years ago. Mount Warning, Lamington Plateau and the Border Ranges between New South Wales and Queensland are among the remnants of this volcano that was originally over 100 kilometres (62 mi) in diameter and nearly twice the height of Mount Warning today, at 1,156 metres (3,793 ft). Despite its size, Tweed Volcano was not a supervolcano; other shield volcanoes—such as in the Hawaiian Islands—are much larger. In the 23 million years since the volcano was active, erosion has been extensive, forming a large erosion caldera around the volcanic plug of Mount Warning. Its erosion caldera is the largest in the Southern Hemisphere.
Beginning during Operation Desert Shield in August 1990, while preparing for the Gulf War, the United States sent a large troop contingent to Saudi Arabia. After the war, remnant troops, primarily U.S. Air Force personnel, augmented by a smaller number of coordinating and training personnel from the U.S. Navy, U.S. Army and U.S. Marine Corps remained in Saudi Arabia under the aegis of Joint Task Force Southwest Asia (JTF-SWA), as part of Operation Southern Watch (OSW). The United Kingdom and France also maintained a small contingent of Royal Air Force and French Air Force training personnel.
Duba is a small city on the northern Red Sea coast, of Saudi Arabia. It is in Tabuk Province. Local citizens describe it as The Pearl of the Red Sea. The population of Duba is about 22,000.
The Nabro Volcano is an active stratovolcano in the Southern Red Sea Region of Eritrea. It is located at the south-east end of the Danakil Alps in the Danakil Depression. Before its 2011 eruption, the volcano was widely believed to be extinct.
The Tomb of Eve, also known as Eve's Grave and Eve's Tomb, is an archeological site located in Jeddah, Saudi Arabia. It is considered by some Muslims to be the burial place of Eve. Prince Faisal, Viceroy of Hejaz, destroyed it in 1928. In 1975, the site was also sealed with concrete by religious authorities, who disapprove of pilgrims praying at tombs.
The Saudi Arabian Air Defense Forces or officially Royal Saudi Air Defense Forces (RSADF) is the aerial defense service branch of the Saudi Arabian Armed Forces. It is fourth of the five service branches of the MOD. It has its HQ in Riyadh, where there is also an elaborate underground command facility that co-ordinates the Arabian Kingdom's advanced "Peace Shield" radar and air defense system, with an estimated 40,000 active duty military personnel in 2015. Along with the Royal Saudi Air Force (RSAF), it has responsibility for securing the skies of Saudi Arabia.
Salma may refer to:
The Peninsula Shield Force is the military arm of the Gulf Cooperation Council (GCC). It is intended to deter, and respond to, military aggression against any of the GCC member countries: Bahrain, Kuwait, Oman, Saudi Arabia, Qatar, and the United Arab Emirates.
Safaniya Oil Field, operated and owned by Saudi Aramco, is the largest offshore oil field in the world. It is located about 265 kilometres (165 mi) north of the company headquarters in Dhahran on the coast of the Persian Gulf, Saudi Arabia. Measuring 50 by 15 kilometres, the field has a producing capability of more than 1.2 million barrels per day.
Madrakah is a village in Makkah Province, in western Saudi Arabia. It is noted as being the first Saudi municipality to elect a woman, Salma bint Hizab al-Oteibi, to its respective Municipal council.
Husain Sirhan was a Saudi Arabian poet. Born in Mecca, he had limited schooling and was largely self-taught. His writing was full of innovative ideas, and he was also exercised by the question of death. He became a recluse in later life. His poetry was translated into English and appeared in two anthologies of Arabian literature.
The Royal Saudi Strategic Missile Force or RSSMF is the fifth branch of the Saudi Arabian Armed Forces, responsible for commissioning long-range strategic missiles. The RSSMF formerly had its headquarters in an underground command facility in Riyadh– the capital of Saudi Arabia.
The Embassy of the Kingdom of Saudi Arabia in Tehran was the diplomatic mission of Saudi Arabia in Iran until January 2016. Direct bilateral diplomatic relations between the two governments were severed following the mob attack and sacking of the embassy in January 2016.
The Salma Mountains is a mountain range in Ha'il Province, Saudi Arabia. Like the Ajā, this range is part of the Shammar range.
On 9 August 2018, Saudi Arabian expeditionary aircraft bombed a civilian school bus passing through a crowded market in Dahyan, Saada Governorate, Yemen, near the border with Saudi Arabia. At least 40 children were killed, all under 15 years old and most under age 10. Sources disagree on the exact number of deaths, but they estimate that the air strike killed about 51 people.
The Shammar Mountains is a mountain range in the northwestern Saudi Arabian province of Ha'il. It includes the Ajā (أَجَا) and Salma subranges.
References
- ↑ "The Salma Caldera complex, northeastern Arabian Shield, Kingdom of Saudi Arabia" (PDF). Retrieved 28 June 2022.
This article incorporates public domain material from websites or documents ofthe United States Geological Survey .
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