"EL COBRE ES CHILENO Y DEBE SER REFINADO EN CHILE" (Por Carlos Tomic E.) | Comité de Defensa y Recuperación del Cobre Chile exporta anualmente 1 millón de toneladas de cobre fino contenido en concentrados de cobre, equivalentes a 3 millones de toneladas de concentrados que se venden al exterior sin fundir ni refinar, y que son procesados en fundiciones y refinerías del extranjero, transformándolos en cobre electrolítico a cambio de importantes descuentos que se aplican al precio del cobre fino contenido. Pero eso no es todo. Si Chile no actúa con prontitud y decisión para corregir este cuello de botella que perjudica seriamente sus ingresos por exportaciones de cobre, dentro de los próximos 4 o 5 años se verá forzado a conceder descuentos de precio equivalentes a US$ 1.500 millones de dólares anuales, una vez que se inicie la producción de concentrados proveniente de nuevos yacimientos, más las ampliaciones de otros ya existentes. Actualmente es más rentable para el propietario de un yacimiento en Chile producir concentrados de cobre que cobre electrolítico.
Rainforest Coloring Pages and Activities for Kids Color in your favorite rainforest birds, mammals, reptiles and plants in our coloring book, or teach yourself about the rainforest with our fun experiments, crafts, and quizzes. Coloring Pages: Amphibians Birds Insects Mammals Plants Reptiles Hands-On Projects from The Remarkable Rainforest Teach yourself about the rainforest with experiments, crafts, and quizzes. These activities are reprinted from The Remarkable Rainforest by Toni Albert, © 1994 by Toni Albert. If you order this book directly from the publishers at 800-353-2791, mention the Rainforest Alliance.
solar 32k 3d 3ds This detailed 3d model comes equipped with two superposed textures, one by day and other one by night with his respective lights. Easy to use, only it needs to move the solar light towards where it is wished and automatic in the shaded part there were activated the lights of the night cities. · Ultra high definition textures.· Ready to render.· Scene lights add.· POLY COUNT can be edited.· Land day/night textures· Atmosphere materials.· Standard Lighting settings (Deflaut render, Cloud Shadow map.)· 32k Textures (32000 x 16000)· Dynamic day/night shader.· High quality fast render.· The number of polygons can be reduced with turbosmooth settings. The scene contains: -4 Spheres·Earth Layer (Day Surface Map, Night Surface texture.) - 3 Textures:·Day Surface Map (32000x16000 px) (Tif format)·Night Surface Map (32000x16000 px) (Tif format)·Cloud Map (16000x8192 px) / Tileable. - 4 Materials No external plugins, deflaut render.
Rain Forest Threats, Rain Forest Species More than half of Earth’s rain forests have already been lost forever to the insatiable human demand for wood and arable land. Rain forests that once grew over 14 percent of the land on Earth now cover only about 6 percent. And if current deforestation rates continue, these critical habitats could disappear from the planet completely within the next hundred years. The reasons for plundering rain forests are mainly economic. Threats Solutions The Dark Side of the Moon (Landing) | earthriderdotcom Some dispute that the U.S. sent a man to the moon. Astronaut Buzz Aldrin is the second man to walk on the moon’s surface in 1969 By Judy Berman Over eight days during July 1969, all eyes were on Apollo 11, when it became the first manned mission to land on the moon. More than 40 years after this historic event, about 6 percent of Americans still dispute that we ever set foot on the moon. They think it was a plot by the government to generate pride during the space race. It fulfilled a goal set by President John F. Apollo 11 made its landing on July 20, 1969. Yet, Bill Kaysing, considered to be the father of the moon hoax, said the whole event was staged. Kaysing, himself, was not an engineer. And, yet, his story had legs. I decided to pick an engineer’s brains on this subject: my Dad. Dad had an analytical mind and addressed some of the claims in Kaysing’s book. Here’s the scoop from the web site science.howstuffworks: Mythbusters’ Adam Savage and Jamie Hyneman I just hope it’s real soon.
News: Rain Forest For centuries, humans have relied on rain forests for a variety of products. Foods such as tomatoes, peppers, corn, rice, coconuts, bananas, coffee, cocoa, tapioca, beans, and sweet potatoes all originally came from the rain forest. Many civilizations have exploited the timber in rain forests and cleared the land for farms. Destructive Activities Unfortunately, human activities have taken a toll on the rain forest. Farming. Cattle ranching also poses a danger to rain forests. Logging. Other activities. Destruction Aftermath The effects of rain-forest destruction are far-reaching, and in many cases are impossible for scientists to assess and to predict. Soil and erosion. Flora and fauna. Climate. Copyright © 2002 Grolier Incorporated.
Why Lead Used to Be Added To Gasoline Today I found out why lead used to be added to gasoline. “Tetraethyl lead” was used in early model cars to help reduce engine knocking, boost octane ratings, and help with wear and tear on valve seats within the motor. Due to concerns over air pollution and health risks, this type of gas was slowly phased out starting in the late 1970’s and banned altogether in all on-road vehicles in the U.S. in 1995. For a more detailed explanation of why lead used to be added to gasoline, it’s necessary to understand a little bit more about gasoline and what properties make it a good combustion material in car engines. Gasoline itself is a product of crude oil that is made of carbon atoms joined together into carbon chains. The different length of the chains creates different fuels. The higher the compression in the cylinders a car’s motor can produce, the greater the power it can get out of each stroke of the piston. In 1919, Dayton Metal Products Co. merged with General Motors. Bonus Facts:
Rain Forest In Brazil, which houses 30 percent of the remaining tropical rain forest on Earth, more than 50,000 square miles of rain forest were lost to deforestation between 2000 and 2005. Biologists worry about the long-term consequences. Drought may be one. Efforts to discourage deforestation, mainly through sustainable-logging initiatives, are underway on a very limited basis but have had a negligible impact so far. The rain forest is nearly self-watering. Plants in the rain forest grow very close together and contend with the constant threat of insect predators. The National Cancer Institute (NCI) estimates that 70 percent of the anti-cancer plants identified so far are rain forest plants. Many trees and plants, like orchids, have been removed from the rain forest and cultivated.