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Seven Lakes Of San Pablo
The Seven Lakes of San Pablo ( fil, Pitong Lawa ng San Pablo) are seven volcanic crater lakes scattered around the City of San Pablo, in the province of Laguna, Philippines. The Lakes The seven lakes of the city are: * Lake Bunot * Lake Calibato, sometimes spelled as Lake Kalibato *The twin lakes of Yambo and Pandin * Lake Palakpakin, sometimes spelled as Lake Palacpaquin or Palacpaquen * Lake Muhikap, also known as Lake Mojicap or Lake Mohicap *Lake Sampaloc, also spelled as Lake Sampalok, the largest of the seven lakes Geology The lakes are maars or low-profile volcanic craters located in the San Pablo Volcanic Field. They are among the 200 small monogenetic volcanoes found along the Macolod Corridor, a rift zone between Mount Makiling and Mount Banahaw, which is part of the larger Southwestern Luzon Volcanic Field. These craters are formed by phreatomagmatic eruptions, an eruption where ground water comes in contact with hot magma pushing up near the Earth's surface. Pet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Crater Lake
A volcanic crater lake is a lake in a crater that was formed by explosive activity or a collapse during a volcanic eruption. Formation Lakes in calderas fill large craters formed by the collapse of a volcano during an eruption. Lakes in maars fill medium-sized craters where an eruption deposited debris around a vent. Crater lakes form as the created depression, within the crater rim, is filled by water. The water may come from precipitation, groundwater circulation (often hydrothermal fluids in the case of volcanic craters) or melted ice. Its level rises until an equilibrium is reached between the rates of incoming and outgoing water. Sources of water loss singly or together may include evaporation, subsurface seepage, and, in places, surface leakage or overflow when the lake level reaches the lowest point on its rim. At such a saddle location, the upper portion of the lake is contained only by its adjacent natural volcanic dam; continued leakage through or surface outflow ac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Makiling
Mount Makiling (also known as Mount Maquiling), is an inactive stratovolcano located in the provinces of Laguna and Batangas on the island of Luzon, Philippines. The mountain rises to an elevation of above mean sea level and is the highest feature of the Laguna Volcanic Field. The volcano has no recorded historic eruption but volcanism is still evident through geothermal features like mud spring and hot springs. South of the mountain is the Makiling-Banahaw Geothermal Plant. The Philippine Institute of Volcanology and Seismology (PHIVOLCS) classifies the volcano as "Inactive". Mount Makiling is a state-owned forest reserve administered by the University of the Philippines Los Baños. Prior to its transfer to the university, the mountain was the first national park of the Philippines. Mount Makiling National Park was established on February 23, 1933, by ''Proclamation No. 552''. However, it was decommissioned as a national park on June 20, 1963, by ''Republic Act no. 3523'' w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metropolitan Manila
Metropolitan Manila (often shortened as Metro Manila; fil, Kalakhang Maynila), officially the National Capital Region (NCR; fil, link=no, Pambansang Punong Rehiyon), is the capital region, seat of government and one of three List of metropolitan areas in the Philippines, defined metropolitan areas in the Philippines. It is composed of 16 Cities of the Philippines#Legal classification, highly urbanized cities: the Manila, city of Manila, Quezon City, Caloocan, Las Piñas, Makati, Malabon, Mandaluyong, Marikina, Muntinlupa, Navotas, Parañaque, Pasay, Pasig, San Juan, Metro Manila, San Juan, Taguig, and Valenzuela, Metro Manila, Valenzuela, as well as the municipality of Pateros. The region encompasses an area of and a population of as of 2020. It is the second most populous and the most densely populated Regions of the Philippines, region of the Philippines. It is also the List of metropolitan areas in Asia, 9th most populous metropolitan area in Asia and the List of larges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reservoir
A reservoir (; from French ''réservoir'' ) is an enlarged lake behind a dam. Such a dam may be either artificial, built to store fresh water or it may be a natural formation. Reservoirs can be created in a number of ways, including controlling a watercourse that drains an existing body of water, interrupting a watercourse to form an embayment within it, through excavation, or building any number of retaining walls or levees. In other contexts, "reservoirs" may refer to storage spaces for various fluids; they may hold liquids or gasses, including hydrocarbons. ''Tank reservoirs'' store these in ground-level, elevated, or buried tanks. Tank reservoirs for water are also called cisterns. Most underground reservoirs are used to store liquids, principally either water or petroleum. Types Dammed valleys Dammed reservoirs are artificial lakes created and controlled by a dam A dam is a barrier that stops or restricts the flow of surface water or underground streams ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
La Mesa Watershed And Eco-Park
The La Mesa Watershed Reservation is a protected area that preserves the only major watershed in Metro Manila, Philippines. Also known as the Novaliches Watershed, it contains the last remaining rainforest of its size in Metro Manila surrounding the La Mesa Dam and Reservoir, the primary source of potable drinking water for 12 million residents in the Manila metropolitan area. The area is under the joint administration, supervision and control of the Department of Environment and Natural Resources and the Metropolitan Waterworks and Sewerage System. It was established in 2007 through Proclamation No. 1336 issued by President Gloria Arroyo. Geography The La Mesa Watershed encompasses an area of in the northern fringes of Quezon City, Caloocan and Rodriguez, Rizal. It is situated on a flat-topped hill or mesa at the foot of the southern Sierra Madre mountain range west of the Marikina Valley. It is about north from the center of Quezon City in Diliman, and some northeast fro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cavite
Cavite, officially the Province of Cavite ( tl, Lalawigan ng Kabite; Chavacano: ''Provincia de Cavite''), is a province in the Philippines located in the Calabarzon region in Luzon. Located on the southern shores of Manila Bay and southwest of Manila, it is one of the most industrialized and fastest-growing provinces in the Philippines. As of 2020, it has a population of 4,344,829, making it the most populated province in the country if the independent cities of Cebu are excluded from Cebu's population figure. The ''de facto'' capital and seat of the government of the province is Trece Martires, although Imus is the official (''de jure'') capital while the City of Dasmariñas is the largest city in the province. For over 300 years, the province played an important role in both the country's colonial past and eventual fight for independence, earning it the title "Historical Capital of the Philippines". It became the cradle of the Philippine Revolution, which led to the r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indang, Cavite
Indang, officially the Municipality of Indang ( tgl, Bayan ng Indang), is a 1st class municipality in the province of Cavite, Philippines. According to the 2020 census, it has a population of 68,699 people. The municipality is situated in the central part of Cavite Province approximately from Tagaytay Ridge. The Municipality consists of the Poblacion and surrounding barangays with a total land area of . Etymology Indang (originally called ) was established as a town in 1655, when it was administratively separated from the nearby town of Silang, Cavite. Indang derived its name from the words "Inrang" or "yndan", a tree which was also called "Anubing". The tree of Inrang was used to be abundant in the local since the early times. History Before 1655: Separation and Independence Indang was part of Silang, Cavite for about 70 years, the municipality of Indang was organized with a prominent native, Juan Dimabiling, as the first gobernadorcillo. The distance between the barrio of I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sulfate
The sulfate or sulphate ion is a polyatomic anion with the empirical formula . Salts, acid derivatives, and peroxides of sulfate are widely used in industry. Sulfates occur widely in everyday life. Sulfates are salts of sulfuric acid and many are prepared from that acid. Spelling "Sulfate" is the spelling recommended by IUPAC, but "sulphate" was traditionally used in British English. Structure The sulfate anion consists of a central sulfur atom surrounded by four equivalent oxygen atoms in a tetrahedral arrangement. The symmetry is the same as that of methane. The sulfur atom is in the +6 oxidation state while the four oxygen atoms are each in the −2 state. The sulfate ion carries an overall charge of −2 and it is the conjugate base of the bisulfate (or hydrogensulfate) ion, , which is in turn the conjugate base of , sulfuric acid. Organic sulfate esters, such as dimethyl sulfate, are covalent compounds and esters of sulfuric acid. The tetrahedral molecular geometry of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petrography
Petrography is a branch of petrology that focuses on detailed descriptions of rocks. Someone who studies petrography is called a petrographer. The mineral content and the textural relationships within the rock are described in detail. The classification of rocks is based on the information acquired during the petrographic analysis. Petrographic descriptions start with the field notes at the outcrop and include macroscopic description of hand specimens. The most important petrographer's tool is the petrographic microscope. The detailed analysis of minerals by optical mineralogy in thin section and the micro-texture and structure are critical to understanding the origin of the rock. Electron microprobe or atom probe tomography analysis of individual grains as well as whole rock chemical analysis by atomic absorption, X-ray fluorescence, and laser-induced breakdown spectroscopy are used in a modern petrographic lab. Individual mineral grains from a rock sample may also be analyze ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magma
Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites. Besides molten rock, magma may also contain suspended crystals and gas bubbles. Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones, mid-ocean ridges and hotspots. Mantle and crustal melts migrate upwards through the crust where they are thought to be stored in magma chambers or trans-crustal crystal-rich mush zones. During magma's storage in the crust, its composition may be modified by fractional crystallization, contamination with crustal melts, magma mixing, and degassing. Following its ascent through the crust, magma may feed a volcano and be extruded as lava, or it may solidify underground to form an intrusion, such as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phreatomagmatic Eruptions
Phreatomagmatic eruptions are volcanic eruptions resulting from interaction between magma and water. They differ from exclusively magmatic eruptions and phreatic eruptions. Unlike phreatic eruptions, the products of phreatomagmatic eruptions contain juvenile (magmatic) clasts.Heiken, G. & Wohletz, K. 1985. Volcanic Ash. University of California Press, Berkeley It is common for a large explosive eruption to have magmatic and phreatomagmatic components. Mechanisms Several competing theories exist as to the exact mechanism of ash formation. The most common is the theory of explosive thermal contraction of particles under rapid cooling from contact with water. In many cases the water is supplied by the sea, for example with Surtsey. In other cases the water may be present in a lake or caldera-lake, for example Santorini, where the phreatomagmatic component of the Minoan eruption was a result of both a lake and later the sea. There have also been examples of interaction between magma a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
