Natural Phenomena



Natural Phenomena - Naturschauspiele - Fenómenos Naturales

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AURORA (POLAR LIGHTS): Polar lights are generated by streams of electrically charged particles "fired" from the sun towards the earth (so called "solar winds") which interact with the air molecules of our atmosphere and produce that way a fluorescent light. This phenomenon occurs only in the  north- and south- polar regions (aurora borealis - aurora australis), where the solar winds can reach the upper atmosphere because they are not repelled by the earth magnetic field which protects the rest of the planet. Only in times of very strong solar activity (every 11 years), when the solar winds become solar storms, polar lights extend over wider areas around the poles.



"AURORA BOREALIS OR THE NORTHERN LIGHTS"



Source: Youtube
Submitted by: loneaurorawolf
Duration: 3 min 07 sec


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TOTAL ECLIPSES: Total Eclipses take place when the moon lies in the axis of sun and earth, so that sun, earth and moon form a straight line. This is a rare constellation because normally the moon passes above or below this axis on its 30 day - trip around the earth. Total solar eclipse: When the (smaller) moon lies between sun and earth, it throws a shade over a part of the earth from where the sun becomes invisible for a few minutes, the sky turns dark and the temperature drops significantly. A special phenomenon of the solar eclipse is the so called "corona". This is the activity of the sun at its edge which is normally covered by its bright main light, but becomes visible to our eyes during a solar eclipse when this light is "turned off". Total lunar eclipse: When the (bigger) earth lies between moon and sun, its shade covers the whole moon so that the moon becomes (almost *) invisible from every location at the dark side of the earth. Remember that the moon doesn´t shine by itself, it is just illuminated by the sun.
(* The still remaining weak red light of the moon is the result of the fact, that the earth´s atmosphere deflects some red parts of the sunlight´s colour spectrum towards the moon whereas it disperses or absorbes the blue parts.)






"TOTAL SOLAR ECLIPSE 2006 TURKEY"


Source: Youtube
Submitted by: SandroBoschetti
Duration: 1 min 22 sec


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"SOLAR ECLIPSE"


Source: Sciencechannel.com
Submitted by: Sciencechannel.com
Duration: 2 min 48 sec


Watch video on Science Channel
(choose video "solar eclipse")






"TOTAL LUNAR ECLIPSE (MOON) 03/03/07"




Source: Youtube
Submitted by: brizzleboi
Duration: 3 min 25 sec


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"LUNAR ECLIPSE MARCH 2007"



Source: Metacafe
Submitted by: deuche
Duration: 7 min 50 sec


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VOLCANIC ERUPTIONS: Volcanic eruptions occur, where openings or ruptures of the earth´s crust allow the escape of molten rocks (so called "magma") which is constantly formed and accumulated at depths of more than 100 km below the surface at temperatures of over 1000 degrees centigrade and under high pressure. The magma contains high amounts of silica and is called "lava" when it reaches the surface. The lava is usually accompanied by ash and gases and in some cases also by rocks, what allows the formation of new volcanoes or even volcanic islands if the eruption takes place in the seabed of the ocean. Submarine volcanic eruptions can pass without leaving any visible trace above the surface, only detected by satellites, or unleash devastating effects like earthquakes and tsunamies. There are a few supervolcanoes on earth whose eruption could cause monumental catastrophes at continental scale and cool down the earth´s temperature for years due to the high amount of ash and gases pumped into the atmosphere. Examples are located in Yellowstone National Park (USA), Lake Taupo (New Zealand) and Lake Toba in Sumatra (Indonesia). Dormant and active volcanoes have also been detected on other planets or their moons in our solar system. (Get -much- more related information about this very extensive matter at Wikipedia / Volcano).



"ETNA LAVA FLOW"



Source: Youtube
Submitted by: Thomas2Reichart
Duration: 3 min 46 sec sec
Location: Italy


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"LAVA ERUPTING FROM VOLCANO"


Source: Youtube
Submitted by: RobCorbett
Duration: 0 min 31 sec


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