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Johannes Herman Frederik Umbgrove
Johannes Herman Frederik Umbgrove HFRSE (5 February 1899 Hulsberg (Limburg) – 14 June 1954 Wassenaar), called in short Jan Umbgrove, was a Dutch geologist and earth scientist. Life Umbgrove studied geology at Leiden University, he finished his studies in 1926. He then became employed as a paleontologist for the (Geological Survey of the Dutch East Indies), where he studied Tertiary foraminifera and corals. He also studied volcanoes, tectonics, coastal morphology and the bathymetry of the seas surrounding the Sunda Islands. From 1929 he went back to Leiden to become the assistant of his former teacher B.G. Escher. In 1930 he became professor in stratigraphy and paleontology at Delft University. His research was again multidisciplinary. He studied the paleogeography of the Dutch East Indies from the data acquired by the gravitational surveys of F.A. Vening Meinesz, the paleontology of corals and coral reefs, tectonics, the geology of the Netherlands and volcanology. Because of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hulsberg
Hulsberg (Limburgish: ''Hölsberg'') is a village in the southeastern Netherlands. It is located in the municipality of Beekdaelen, Limburg, about 15 km east of Maastricht. History The village was first mentioned in 1147 as Huleberga, and means "hill of holly (''Ilex aquifolium'')". The area around Hulsberg was donated to the in 968. Hulsberg is a village with a ' (type of village square). The Catholic St Clemens Church is a three aisled church from 1820. In 1908, Joseph Cuypers designed a new choir. The remainder was redesigned in 1930. Hulsberg was home to 332 people in 1840. Until 1982, Hulsberg was a municipality of its own. After the re-arrangement of the municipalities in the Netherlands, Hulsberg and Schimmert were merged with the municipality of Nuth. In 2019, Nuth merged into Beekdaelen. Hulsberg is popular stay-over place for Dutch. Its accommodations include two campings, and several hotels and motels). Hulsberg is only 3 kilometres from Valkenburg aan de Geul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coral
Corals are marine invertebrates within the class Anthozoa of the phylum Cnidaria. They typically form compact colonies of many identical individual polyps. Coral species include the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton. A coral "group" is a colony of very many genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in height. A set of tentacles surround a central mouth opening. Each polyp excretes an exoskeleton near the base. Over many generations, the colony thus creates a skeleton characteristic of the species which can measure up to several meters in size. Individual colonies grow by asexual reproduction of polyps. Corals also breed sexually by spawning: polyps of the same species release gametes simultaneously overnight, often around a full moon. Fertilized eggs form planulae, a mobile early form of the coral polyp which, when m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanology
Volcanology (also spelled vulcanology) is the study of volcanoes, lava, magma and related geological, geophysical and geochemical phenomena (volcanism). The term ''volcanology'' is derived from the Latin word ''vulcan''. Vulcan was the ancient Roman god of fire. A volcanologist is a geologist who studies the eruptive activity and formation of volcanoes and their current and historic eruptions. Volcanologists frequently visit volcanoes, especially active ones, to observe volcanic eruptions, collect eruptive products including tephra (such as ash or pumice), rock and lava samples. One major focus of enquiry is the prediction of eruptions; there is currently no accurate way to do this, but predicting eruptions, like predicting earthquakes, could save many lives. Modern volcanology image:Icelandic tephra.JPG, Volcanologist examining tephra horizons in south-central Iceland. In 1841, the first volcanological observatory, the Vesuvius Observatory, was founded in the Kingdom o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coral Reef
A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups. Coral belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones and jellyfish. Unlike sea anemones, corals secrete hard carbonate exoskeletons that support and protect the coral. Most reefs grow best in warm, shallow, clear, sunny and agitated water. Coral reefs first appeared 485 million years ago, at the dawn of the Early Ordovician, displacing the microbial and sponge reefs of the Cambrian. Sometimes called ''rainforests of the sea'', shallow coral reefs form some of Earth's most diverse ecosystems. They occupy less than 0.1% of the world's ocean area, about half the area of France, yet they provide a home for at least 25% of all marine species, including fish, mollusks, worms, crustaceans, echinoderms, sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Felix Andries Vening Meinesz
Felix Andries Vening Meinesz (30 July 1887 – 10 August 1966) was a Dutch geophysicist and geodesist. He is known for his invention of a precise method for measuring gravity (gravimetry). Thanks to his invention, it became possible to measure gravity at sea, which led him to the discovery of gravity anomalies above the ocean floor. He later attributed these anomalies to continental drift. He was a Fellow of the Royal Society. Biography Vening Meinesz's father, Sjoerd Anne Vening Meinesz, was mayor, first of Rotterdam, then of Amsterdam. Felix was born in The Hague grew up in a protected environment. In 1910 he graduated in civil engineering in Delft. The same year he started working for the Dutch gravity survey. In 1915 he wrote his dissertation on the defects of the gravimeters used at that time. Vening Meinesz then designed a new gravimeter, which the KNMI (Royal Dutch Meteorological Institute) built. The apparatus has two pendula of the same size hanging in a frame but ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleogeography
Palaeogeography (or paleogeography) is the study of historical geography, generally physical landscapes. Palaeogeography can also include the study of human or cultural environments. When the focus is specifically on landforms, the term paleogeomorphology is sometimes used instead. Paleomagnetism, paleobiogeography, and tectonic history are among its main tools. Palaeogeography yields information that is crucial to scientific understanding in a variety of contexts. For example, palaeogeographical analysis of sedimentary basins plays a key role in the field of petroleum geology, because ancient geomorphological environments of the Earth's surface are preserved in the stratigraphic record. Palaeogeographers also study the sedimentary environment associated with fossils for clues to the evolutionary development of extinct species. Palaeogeography is furthermore crucial to the understanding of palaeoclimatology, due to the impact of the positions of continents and oceans on infl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Delft University
Delft University of Technology ( nl, Technische Universiteit Delft), also known as TU Delft, is the oldest and largest Dutch public technical university, located in Delft, Netherlands. As of 2022 it is ranked by QS World University Rankings among the top 10 engineering and technology universities in the world. In the fields of architecture and civil engineering, it was ranked 2nd in the world, after MIT (Massachusetts Institute of Technology). With eight faculties and numerous research institutes, it has more than 26,000 students (undergraduate and postgraduate) and 6,000 employees (teaching, research, support and management staff). The university was established on 8 January 1842 by William II of the Netherlands as a Royal Academy, with the primary purpose of training civil servants for work in the Dutch East Indies. The school expanded its research and education curriculum over time, becoming a polytechnic school in 1864 and an institute of technology (making it a full-fledged ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratigraphy
Stratigraphy is a branch of geology concerned with the study of rock (geology), rock layers (Stratum, strata) and layering (stratification). It is primarily used in the study of sedimentary rock, sedimentary and layered volcanic rocks. Stratigraphy has three related subfields: lithostratigraphy (lithologic stratigraphy), biostratigraphy (biologic stratigraphy), and chronostratigraphy (stratigraphy by age). Historical development Catholic priest Nicholas Steno established the theoretical basis for stratigraphy when he introduced the law of superposition, the principle of original horizontality and the principle of lateral continuity in a 1669 work on the fossilization of organic remains in layers of sediment. The first practical large-scale application of stratigraphy was by William Smith (geologist), William Smith in the 1790s and early 19th century. Known as the "Father of English geology", Smith recognized the significance of Stratum, strata or rock layering and the importance ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Berend George Escher
Berend George Escher (4 April 1885 – 11 October 1967) was a Dutch geologist. Escher had a broad interest, but his research was mainly on crystallography, mineralogy and volcanology. He was a pioneer in experimental geology. He was a half-brother of the artist Maurits Cornelis Escher, M.C. Escher, and had some influence on his work due to his knowledge of crystallography. M.C. Escher created a woodcut ''ex libris'' for his brother 'Beer' with a stylized image of a volcano around 1922 (Bool number 91). Escher was the son of the civil engineer George Arnold Escher, G. A. Escher, a director of the Dutch watermanagement (''Rijkswaterstaat'') and his first wife, Charlotte Marie Hartitzsch. Escher spent his youth in Switzerland. He studied geology at the ETH Zurich, Eidgenössische Technische Hochschule (Technical University) of Zürich, where he was a pupil of Albert Heim. He finished his studies in 1911 and returned to the Netherlands where he first became the assistant of Eugèn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leiden
Leiden (; in English and archaic Dutch also Leyden) is a city and municipality in the province of South Holland, Netherlands. The municipality of Leiden has a population of 119,713, but the city forms one densely connected agglomeration with its suburbs Oegstgeest, Leiderdorp, Voorschoten and Zoeterwoude with 206,647 inhabitants. The Netherlands Central Bureau of Statistics (CBS) further includes Katwijk in the agglomeration which makes the total population of the Leiden urban agglomeration 270,879, and in the larger Leiden urban area also Teylingen, Noordwijk, and Noordwijkerhout are included with in total 348,868 inhabitants. Leiden is located on the Oude Rijn, at a distance of some from The Hague to its south and some from Amsterdam to its north. The recreational area of the Kaag Lakes (Kagerplassen) lies just to the northeast of Leiden. A university city since 1575, Leiden has been one of Europe's most prominent scientific centres for more than four centuries. Leide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunda Islands
The Sunda Islands ( id, Kepulauan Sunda) are a group of islands in the Malay Archipelago.Chisholm, Hugh, ed. (1911). "Sunda Islands" . ''Encyclopædia Britannica''. 26 (11th ed.). Cambridge University Press. They consist of the Greater Sunda Islands and the Lesser Sunda Islands. Administration The Sunda Islands are divided among four countries: Brunei, East Timor, Indonesia and Malaysia. The majority of these islands fall under the jurisdiction of Indonesia. Borneo is part of Brunei, Indonesia and Malaysia. Timor is part of East Timor and Indonesia. Sebatik is part of Indonesia and Malaysia. List of islands * Greater Sunda Islands ** Borneo ** Java ** Sulawesi ** Sumatra * Lesser Sunda Islands (from west to east) ** Bali ** Lombok ** Sumbawa ** Sumba ** Komodo ** Flores ** Savu ** Rote ** Timor ** Alor Archipelago ** Atauro ** Barat Daya Islands ** Tanimbar Islands See also * Banda Arc * Komodo (island) * List of islands of Indonesia * Malay Archipelago * Nusant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bathymetry
Bathymetry (; ) is the study of underwater depth of ocean floors (''seabed topography''), lake floors, or river floors. In other words, bathymetry is the underwater equivalent to hypsometry or topography. The first recorded evidence of water depth measurements are from Ancient Egypt over 3000 years ago. Bathymetric (or hydrographic) charts are typically produced to support safety of surface or sub-surface navigation, and usually show seafloor relief or terrain as contour lines (called depth contours or isobaths) and selected depths ('' soundings''), and typically also provide surface navigational information. Bathymetric maps (a more general term where navigational safety is not a concern) may also use a Digital Terrain Model and artificial illumination techniques to illustrate the depths being portrayed. The global bathymetry is sometimes combined with topography data to yield a global relief model. Paleobathymetry is the study of past underwater depths. Seabed topography ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
