volcanoes-ppt.pptx

 PLATE TECTONIC THEORY As the molten rock moves in the mantle, with the extreme pressure, some of the molten rocks escapes through the cracks in the crust and along boundaries of the tectonic plates resulting in Earthquakes and some Volcanic Activities. VOLC NOES STRUCTURE AND DISTR...

 PLATE TECTONIC THEORY As the molten rock moves in the mantle, with the extreme pressure, some of the molten rocks escapes through the cracks in the crust and along boundaries of the tectonic plates resulting in Earthquakes and some Volcanic Activities. VOLC NOES STRUCTURE AND DISTRIBUTIONS Philippines is blessed with volcanoes. Below are some of them. Can you name them?  WHAT IS VOLCANO? - mountains that emit volcanic products like lava, rocks, ashes and gases from the interior of the earth through its vent.  WHAT IS VOLCANO? - its also describe as mountain that are formed through the deposit of these volcanic products characterized by shape and structure of volcanic activity  A volcano is an opening in a planet or moon’s crust through which molten rock and gases trapped under the surface erupt, often forming a hill or mountain. Volcanoes form when magma is forced up and flows onto Earth’s surface as lava. Volcanoes often form in places where plates are moving apart, where plates are moving together, and at locations called hot spots. Active volcanoes are commonly found at plate boundaries. The Ring of fire is a belt Fig. 6 Formation of Volcano of active volcanoes that circles that Pacific Ocean.  HOW DO VOLCANOES FORM? A volcano is formed when hot molten rock, ash and gases escape from an opening in the Earth's surface. The molten rock and ash solidify as they cool, forming the distinctive volcano shape. As a volcano erupts, it spills lava that flows downslope. Hot ash and gases are thrown into the air. Some volcanoes form because of collision of large plates of Earth’s crust and upper mantle. This process has produced a string of volcanic islands, which includes Montserrat. These islands are forming as plates made up of oceanic crust and mantle collide.  The older and denser oceanic plate subducts, or sinks beneath, the less dense plate. When one plate sinks under another plate, rock in and above the sinking plate melts, forming chambers of magma. This magma is the source for volcanic eruptions that have KINDS OF VOLCANOES BASED ON STRUCTURE 1. Cinder Cone Volcano 2. Shield Volcano 3. Composite Volcano Cinder Cone Volcano Cinder cones are the simplest type of volcano. They are built from particles and blobs of congealed lava ejected from a single vent.  Steep slope Emits ash during eruption Shield Volcano  Wide base and emits lava.  Looks like a shield hence the name.  formed from many magma flows of low viscosity.  Composite Volcano  Half way of having steep slope and wide base.  Emits both ash and lava  also called stratovolcanoes, are cone-shaped volcanoes built from many layers of lava, pumice, ash, and tephra(pyroclastic VOLCANOES BASED ON ACTIVITY Active Volcano – that are “currently erupting or are expected to erupt in the near future VOLCANOES BASED ON ACTIVITY Dormant Volcano – that are “not currently erupting but have erupted within recordable history are expected to erupt again in the future. VOLCANOES BASED ON ACTIVITY Extinct Volcano – that are “considered as dead and are not expected to erupt in the future. DISTRIBUTION OF VOLCANOES IN THE PHILIPPINES, THERE ARE TWENTY-FOUR ACTIVE VOLCANOES AS LISTED BY DELOS REYES ET. AL. (2018). No. Name of Volcano Latitude Longitude Province 1 Babuyan Claro 19.52408 121.95005 Babuyan Island Group, Cagayan in Luzon 2 Banahaw 14.06038 121.48803 Boundaries of Laguna and Quezon in Luzon 3 Biliran (Anas) 11.63268 124.47162 Leyte in Visayas 4 Bud Dajo 6.01295 121.05772 Sulu in Mindanao 5 Bulusan 12.76853 124.05445 Sorsogon, Bicol Region in Luzon 6 Cabalian 10.27986 125.21598 Southern Leyte in Visayas 7 Cagua 18.22116 122.1163 Cagayan in Luzon 8 Camiguin de Babuyanes 18.83037 121.86280 Babuyan Island Group, Cagayan in Luzon 9 Didicas 19.07533 122.20147 Babuyan Island Group, Cagayan in Luzon 10 Hibok-hibok 9.20427 124.67115 Camiguin in Mindanao  INACTIVE VOLCANOE S IN THE 1.Atimbia Volcano Laguna PHILIPPINE 2.Bangcay Volcano S Nueva Ecija 3.Balungao Volcano Pangasinan Pacific Ring of Fire The Pacific Ring of Fire where the Philippines is situated along with, comprises the tectonic boundaries of Pacific Plate, Philippine Plate, Eurasian Plate, Juan de Fuca and Cocos plates, and the Nazca Plate Pacific Ring of Fire The map shows that The Pacific Ring of Fire volcanoes are not randomly where the Philippines is distributed around the situated along with, world. Majority of them are comprises the tectonic found along the edges of boundaries of some continents particularly Pacific Plate, in the western coast of Philippine Plate, North and South America, Eurasian Plate, East and South East Asia. Juan de Fuca and There are also scattered Cocos plates, and the volcanoes which have no Nazca Plate relation to the belts of folding, and which show no From the two map, we can say that volcanoes around the world are situated along the plate boundaries.  HOMEWORK Interview your grandfather/grandmother about their experience during the Mt. Pinatubo eruption.