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Natib
Mount Natib is a dormant stratovolcano and caldera complex in the province of Bataan on western Luzon Island of the Philippines. The volcano complex occupies the northern portion of the Bataan Peninsula. The mountain and adjacent surrounding is a protected area first declared as the Bataan National Park in 1945.Mt. Natib" . Bataan...Raging Peninsula. Retrieved on 2012-02-21. Physical features 
Mount Natib is a type of volcano topped by a acorn-sh ...
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List Of Potentially Active Volcanoes In The Philippines
This is a list of potentially active volcanoes in the Philippines, as classified by the Philippine Institute of Volcanology and Seismology. List See also * List of active volcanoes in the Philippines * List of inactive volcanoes in the Philippines * List of mountains in the Philippines References Philippine Institute of Volcanology and Seismology (PHIVOLCS) Potentially Active Volcano list Philippine Institute of Volcanology and Seismology (PHIVOLCS) Active Volcano list Philippine Institute of Volcanology and Seismology (PHIVOLCS) Inactive Volcano list External links * {{Volcanoes of the Philippines 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 are ... Philippines, potentially active *potentially Volcanism of the Philippines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bataan
Bataan (), officially the Province of Bataan ( fil, Lalawigan ng Bataan ), is a province in the Central Luzon region of the Philippines. Its capital is the city of Balanga while Mariveles is the largest town in the province. Occupying the entire Bataan Peninsula on Luzon, Bataan is bordered by the provinces of Zambales and Pampanga to the north. The peninsula faces the South China Sea to the west and Subic Bay to the north-west, and encloses Manila Bay to the east. The Battle of Bataan is known in history as one of the last stands of American and Filipino soldiers before they were overwhelmed by the Japanese forces in World War II. The Bataan Death March was named after the province, where the infamous march started. History Classical Period The first inhabitants of the Bataan peninsula are the Ayta Magbeken people, who are one of the first Negrito ancestors of present-day Filipinos. Later on, Tagalog communities from southern Luzon migrated to parts of Bataan and the Ayta Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zambales Mountains
The Zambales Mountains is a mountain range on western Luzon island in the Philippines. The mountains separate Luzon's central plain from the South China Sea. Its most prominent section is known as the Cabusilan Mountain Range composed of Mount Pinatubo, Mount Negron and Mount Cuadrado, which are believed to be remnants of the ancestral Pinatubo peak. The highest elevation in the Zambales Mountains is Mount Tapulao, also known as High Peak, in Zambales province which rises to . Extent The Zambales Mountains has an area of extending North to South from the mountains of western Pangasinan province, the whole length of Zambales, to tip of the Bataan Peninsula in the south enclosing Manila Bay.Smith, Warren D. (1913)"Journal of Geology, Vol. 21 – The Geology of Luzon, P.I." pp. 39–40. University of Chicago, Department of Geology. The mountain range also encompasses the mountains in the municipalities of Bamban, Capas, San Jose, San Clemente, Mayantoc, Santa Ignacia, Camiling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Mariveles
Mount Mariveles is a dormant stratovolcano and the highest point in the province of Bataan in the Philippines. Mariveles and the adjacent Mount Natib comprise 80.9 percent of the total land area of the province.Redpen (2008-01-24)"Bataan Mountains" MyBataan.com. Retrieved on 2011-09-15. The mountain and adjacent cones lie opposite the city of Manila across Manila Bay, providing a beautiful setting for the sunsets seen from the city. Location Mount Mariveles lies at the southern end of the Zambales Mountains in the Bataan Peninsula, west of Manila Bay. Bataan province belongs to the Central Luzon (Region III), of the Philippines. Physical features Mount Mariveles is a massive stratovolcano topped with a summit caldera which drains to the north. The highest peak, called Mariveles, has an elevation of asl. Mounts Pantingan, Bataan, Tarak, and Vintana are the other peaks of the volcano-caldera complex, which has a base diameter of . Mount Samat on the northern slope, and Mount Li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bataan Peninsula
Bataan (), officially the Province of Bataan ( fil, Lalawigan ng Bataan ), is a province in the Central Luzon region of the Philippines. Its capital is the city of Balanga while Mariveles is the largest town in the province. Occupying the entire Bataan Peninsula on Luzon, Bataan is bordered by the provinces of Zambales and Pampanga to the north. The peninsula faces the South China Sea to the west and Subic Bay to the north-west, and encloses Manila Bay to the east. The Battle of Bataan is known in history as one of the last stands of American and Filipino soldiers before they were overwhelmed by the Japanese forces in World War II. The Bataan Death March was named after the province, where the infamous march started. History Classical Period The first inhabitants of the Bataan peninsula are the Ayta Magbeken people, who are one of the first Negrito ancestors of present-day Filipinos. Later on, Tagalog communities from southern Luzon migrated to parts of Bataan and the Ayta Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bataan National Park
Bataan National Park is a protected area of the Philippines located in the mountainous interior of Bataan province in the Central Luzon Region. The park straddles the northern half of Bataan Peninsula near its border with Subic Bay Freeport Zone. The park was first established in 1945 under Proclamation No. 24 with an initial area of 31,000 hectares and included portions of the fenced area of Subic Bay Freeport Zone. The park was reduced in 1987 to its present size of and is now wholly located in Bataan province. The park encompasses the Bataan towns and cities of Hermosa, Orani, Samal, Abucay, Balanga, Bagac and Morong. Mount Natib with its wide forested acorn-shaped caldera is located in the middle of the park. Activities in the park include nature viewing, bird watching, and trekking to its several peaks and waterfalls. The park is located from Manila, its mountains can be seen across Manila Bay from the city. Topography and ecology Bataan National Park is covered b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocene
The Holocene ( ) is the current geological epoch. It began approximately 11,650 cal years Before Present (), after the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene has been identified with the current warm period, known as MIS 1. It is considered by some to be an interglacial period within the Pleistocene Epoch, called the Flandrian interglacial.Oxford University Press – Why Geography Matters: More Than Ever (book) – "Holocene Humanity" section https://books.google.com/books?id=7P0_sWIcBNsC The Holocene corresponds with the rapid proliferation, growth and impacts of the human species worldwide, including all of its written history, technological revolutions, development of major civilizations, and overall significant transition towards urban living in the present. The human impact on modern-era Earth and its ecosystems may be considered of global si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tuffs
Tuff is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is lithified into a solid rock. Rock that contains greater than 75% ash is considered tuff, while rock containing 25% to 75% ash is described as tuffaceous (for example, ''tuffaceous sandstone''). Tuff composed of sandy volcanic material can be referred to as volcanic sandstone. Tuff is a relatively soft rock, so it has been used for construction since ancient times. Because it is common in Italy, the Romans used it often for construction. The Rapa Nui people used it to make most of the ''moai'' statues on Easter Island. Tuff can be classified as either igneous or sedimentary rock. It is usually studied in the context of igneous petrology, although it is sometimes described using sedimentological terms. Tuff is often erroneously called tufa in guidebooks and in television programmes. Volcanic ash The material that is expelled in a volcanic e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dacite
Dacite () is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyolite. It is composed predominantly of plagioclase feldspar and quartz. Dacite is relatively common, occurring in many tectonic settings. It is associated with andesite and rhyolite as part of the subalkaline volcanic rock, subalkaline tholeiite, tholeiitic and calc-alkaline magma series. Composition Dacite consists mostly of plagioclase feldspar and quartz with biotite, hornblende, and pyroxene (augite or enstatite). The quartz appears as rounded, corroded phenocrysts, or as an element of the ground-mass. The plagioclase in dacite ranges from oligoclase to andesine and labradorite. Sanidine occurs, although in small proportions, in some dacites, and when abundant gives rise to rocks that form rhyodacite, transitions to the rhyolites. The rel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Andesite
Andesite () is a volcanic rock of intermediate composition. In a general sense, it is the intermediate type between silica-poor basalt and silica-rich rhyolite. It is fine-grained (aphanitic) to porphyritic in texture, and is composed predominantly of sodium-rich plagioclase plus pyroxene or hornblende. Andesite is the extrusive equivalent of plutonic diorite. Characteristic of subduction zones, andesite represents the dominant rock type in island arcs. The average composition of the continental crust is andesitic. Along with basalts, andesites are a component of the Martian crust. The name ''andesite'' is derived from the Andes mountain range, where this rock type is found in abundance. It was first applied by Christian Leopold von Buch in 1826. Description Andesite is an aphanitic (fine-grained) igneous rock that is intermediate in its content of silica and low in alkali metals. It has less than 20% quartz and 10% feldspathoid by volume, with at least 65% of the fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hornblende
Hornblende is a complex inosilicate series of minerals. It is not a recognized mineral in its own right, but the name is used as a general or field term, to refer to a dark amphibole. Hornblende minerals are common in igneous and metamorphic rocks. The general formula is . Physical properties Hornblende has a hardness of 5–6, a specific gravity of 3.0 to 3.6, and is typically an opaque green, dark green, brown, or black color. It tends to form slender prismatic to bladed crystals, diamond-shaped in cross-section, or is present as irregular grains or fibrous masses. Its planes of cleavage intersect at 56° and 124° angles. Hornblende is most often confused with the pyroxene series and biotite mica, which are also dark minerals found in granite and charnockite. Pyroxenes differ in their cleavage planes, which intersect at 87° and 93°. Hornblende is an inosilicate (chain silicate) mineral, built around double chains of silica tetrahedra. These chains extend the length of t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Biotite
Biotite is a common group of phyllosilicate minerals within the mica group, with the approximate chemical formula . It is primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous end-members include siderophyllite and eastonite. Biotite was regarded as a mineral ''species'' by the International Mineralogical Association until 1998, when its status was changed to a mineral ''group''. The term ''biotite'' is still used to describe unanalysed dark micas in the field. Biotite was named by J.F.L. Hausmann in 1847 in honor of the French physicist Jean-Baptiste Biot, who performed early research into the many optical properties of mica. Members of the biotite group are sheet silicates. Iron, magnesium, aluminium, silicon, oxygen, and hydrogen form sheets that are weakly bound together by potassium ions. The term "iron mica" is sometimes used for iron-rich biotite, but the term also refers to a flaky micaceous form ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
