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A keen eye will discern a sloth on a branch or the eyes and snout of a caiman breaking the surface of a mangrove swamp, while alert ears will catch rustling leaves signaling a troop of white-faced capuchins or the haunting call of a howler monkey. Article Top five nerve-shredding road trips in Costa Rica Renting a car in Costa Rica is costly and can even be dangerous if you're not prepared for what's to come
The National Map: Small Scale
Although the 1997-2014 Edition of the National Atlas of the United States was retired in September 2014, The National Map recognizes the importance of continuing to make a collection of the small-scale datasets, originally developed for the National Atlas, available to users. The National Map Small-Scale website also link to Global Map, an international effort by national mapping organizations to produce consistent and accurate mapping data of the world at a scale of 1:1,000,000
Forces of Nature -- National Geographic
Sustainability at National Geographic The National Geographic Society aims to be an international leader for global conservation and environmental sustainability
Declaration of Independence
The political philosophy of the Declaration was not new; its ideals of individual liberty had already been expressed by John Locke and the Continental philosophers. Learn more about the Writing and Publicizing of the Declaration of Independence, the Articles of Confederation, and the Constitution of the United States by visiting the Independence National Historical Park (Philadelphia, Pennsylvania) web site
Glossary of Terms: C
Some scientists believe higher concentrations of carbon dioxide and other greenhouse gases will result in an enhancement of the greenhouse effect and global warming. Rain is usually the precipitation type that is formed, and in most cases this moisture is delivered in large amounts over short periods of time in extremely localized areas
What will really happen when the Yellowstone supervolcano erupts?
If you want to know more about how supervolcanoes have affected the history of the planet, you can learn about that in my new book, Scatter, Adapt and Remember: How Humans Will Survive a Mass Extinction. Lowenstern and the team of scientists at the Yellowstone Volcano Observatory are constantly studying the caldera, looking for changes and working on projections of what the next eruption might be like
The "new vent rim," created by the overflows, is visible in the above photos as the dark-colored layer of lava atop older, light-colored rock exposed in the vent walls
Making Beer With Rocks: Do you know which fossiliferous rock is used to make beer? Wrong Volcano The most powerful eruption of the 20th century was misidentified? Labradorite: A feldspar that produces bright flashes of iridescent colors. Pictures of Opal: A collection of different types of opal from all around the world and Mars too! Sliding Rocks Mystery: What causes these rocks to slide across a Death Valley playa? Ant Hill Garnets are tiny garnets that ants haul to the surface and discard on their anthill
Volcanic Gases and Their Effects
It also causes acid rain downwind from volcanoes because HCl is extremely soluble in condensing water droplets and it is a very "strong acid" (it dissociates extensively to give H+ ions in the droplets). At low concentrations it can irritate the eyes and acts as a depressant; at high concentrations it can cause irritation of the upper respiratory tract and, during long exposure, pulmonary edema
Geologists believe that, if spreading continues, the three plates that meet at the edge of the present-day African continent will separate completely, allowing the Indian Ocean to flood the area and making the easternmost corner of Africa (the Horn of Africa) a large island. Picture two giant conveyor belts, facing each other but slowly moving in opposite directions as they transport newly formed oceanic crust away from the ridge crest
Volcanic Ash, What it can do and how to minimize damage
Volcanic gases and aerosols Information relating to the health hazards of gases and aerosols typically emitted during volcanic activity are also available from the International Volcanic Health Hazard Network (IVHHN).See introduction to volcanic gases and guidelines based on international urban and industrial pollution studies
Thus, areas within hazard zones PA and DA have a higher probability of being affected during the next eruption than do areas within hazard zones PB and DB, which reflect a vent located on the volcano's west, north, or east flank. For most residents, however, tephra will be a nuisance and can be mitigated by such actions as shutting down and covering equipment, frequently replacing air filters in machinery, wearing dust masks, and avoiding unnecessary travel
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