Porphyritic - Black Ops Game Clip Game Clip
Giant Foot Print 200 Million Yrs Old - South Africa Michael Tellinger shows off what could be one of the best pieces of evidence that there were giants on Earth a long, long time ago. Geologists have marvelled at this giant foot print in rough granite, about 4 feet long. Some still say that it is a natural erosion pattern. Personally I find that suggestion highy improbable for various reasons that I will not go into here. Prof. Pieter Wagener from UPE, suggests that "there is a higher probability of little green men arriving from space and licking it out with their tongues, than being created by natural erosion". It is located in South Africa, near the town of Mpaluzi, close to the Swaziland border. It is estimated to be between 200 million and 3 Billion years old because of our current understanding of the formation of granites in Earth's history. This dating immediately causes great debate and argument - so I urge you to keep your mind open and focused on the evidence. This amazing footprint in granite was discovered in 1912 by a hunter called Stoffel Coetzee, while hunting in the remote area. At the time this was a deeply remote part of South Africa known as the Eastern Transvaal, teeming with wild life, including antelope and lions. It remains in the same condition as it was when first discovered and the possibility that this was a carved hoax is extremely low because of its remote location. Even today, it is difficult to find. The real mystery is how this amazing phenomenon occured - I have no idea - but here it is ...
Ventifacts Oct 2010.wmv Ventifacts are rocks that have been created by windblown sand, typically found in a desert environment. The sand is blown by the wind in a bouncing manner, called saltation, and impacts the rocks on the desert floor. If the rock remains stationary for hundreds of years, the action of the sand is to create a facet - a flat, fairly smooth surface on the rock. Many ventifacts have more than one facet. This is due to either a change in wind direction or the rock shifts its position relative to the wind. In any case, where one facet meets another a ridge separates the two. The ventifacts displayed in this video are of a fine grained basalt or porphyritic basalt. The fine grained nature of this volcanic rock allowed for very nice developemnt of the facets.
Olivine Beach, Hawaii A beach on the "Big Island" of Hawaii, in which the sand has an abundance of the mafic mineral olivine, is the subject of this educational video. The Hawaiian Island volcanics are considered mafic (high in iron and magnesium) and many of the basalts are porphyritic with phenocrysts of olivine (as shown in the video). Although basalt flows are the norm on the islands, there are also many small cinder cones. When these cinder cones are on the shore, the waves easily erode them. This is due to the fact that the cones consist primarily of unconsolidated volcanic material, including dust, ash, and lapilli. Because of the mafic nature of the cones, much olivine is released from the cinder cones and accumulates to form beaches . Olivine is not very stable in the beach environment, it quickly erodes and washes away. The reason that the beach sand is so rich in olivine is that it is constantly being replenished from the cinder cone. In this way the beach face is like a conveyor belt - the olivine rich pyroclastic material from the cinder cone is constantly replenishing the sand on the beach, which is constantly being eroded away by wave action. And, yes, when the cinder cone has been completely eroded away, there will no longer be a olivine rich beach at this location. But, there are other cinder cones near the present shoreline of the Big Island that will produce future green sand beaches.
Video 111 (2).MP4 This video describes the formation of intrusive and extrusive igneous rocks showing examples of granite, Diorite, gabbro, basalt, andesite, rhyolite, as well as porphyritic rocks and volcanic bombs, pumice , AA lava, pahoi-hoi lava and obsidian. Volcanic bombs come from Yellowstone Super Volcano. Aphanitic and phanoritic textures are discussed.
Finding turquoise. Interactive Google maps for turquoise and gold SiriusMined: "How abundant is turquoise in areas that one would hunt it? How much could someone find in a typical day?" Turquoise / Gemstone mines and prospects in San Bernardino County, California, on a Google Map: Turquoise / Gemstone mines and prospects in the MRDS, Microsoft Excel spreadsheet: About Turquoise: "In the American southwest turquoise is almost invariably associated with the weathering products of copper sulfide deposits in or around potassium feldspar bearing porphyritic intrusives.... turquoise is often recovered as a byproduct of large-scale copper mining operations, especially in the United States." Gold mines and prospects in San Bernardino County, California, on a Google Map (a large document):
Igneous Rocks Igneous Rocks by Diana, Alyssa, & Meghan Citation: " - Earth Science News, Maps, Dictionary, Articles, Jobs." - Earth Science News, Maps, Dictionary, Articles, Jobs. Np, nd Web. 8 Apr. 2011. " | Free Online Dictionary for English Definitions." | Free Online Dictionary for English Definitions. Np, nd Web. 8 Apr. 2011. "10(e) Characteristics of Igneous Rocks." Geography : Physical Geography. Np, nd Web. 8 Apr. 2011. Pellant, Chris. Rocks and Minerals . New York: Dorling Kindersley, 1992. Print. "Rock - Index Page." Welcome to Battle Ground School District. Np, nd Web. 8 Apr. 2011. www.bgsd.k12.wa.us
Earth Science (Part 3): The Rock Cycle Part 3...Rocks...the rock cycle and the types of rocks of the Earth. The Rock Cycle is a model that illustrates the origin of the three basic types of rock, the processes in which they form, and how they are interrelated. The rock cycle is obviously a cycle, so for the purpose of seeing how it works, I'm going to start at one point in the cycle and go from there. Magma, lava when it reaches the surface, cools and solidifies in a process called crystallization, forming Igneous rock. Weathering and erosion breaks down the igneous rock, transports it and deposits it as sediment. Sediment is compacted and cemented to for sedimentary rock, a process called lithification. The sedimentary rock is buried deep under the crust by geologic forces. Heat and pressure(stress) cause it to become metamorphic rock. If the rock is pushed deeper beneath the crust, it melts into magma, starting the cycle over again. Igneous rock can also become metamorphic through heat and pressure. Metamorphic and sedimentary rock can also be weathered into sediment. Igneous rock: slow cooling results in formation of large crystals, rapid cooling results in the formation of a solid mass of small crystals. Texture-the size and arrangement of interlocking crystals(fine-grained, course-grained, porphyritic, glassy). Silica (SiO2) is the most abundant constituent of igneous rock. They are classified by their texture and mineral composition. Weathering types that break down igneous rock into sediment: Mechanical ...