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Atmospheric gases scatter blue wavelengths of visible light more than other wavelengths, giving the Earth’s visible edge a blue halo. At higher and higher altitudes, the atmosphere becomes so thin that it essentially ceases to exist. Gradually, the atmospheric halo fades into the blackness of space.
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in March 2004, causing devastating damage. This was taken just before landfall, when the system was at its peak intensity about 333 km (207 mi) east of
Madagascar, with sustained windspeed of 260 km/h (160 mph). At least 250 people were listed dead, with more missing, and 300,000 people were left
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that are falling from the cloud and being caught by the high level winds. The streaks point in the direction of the wind and may appear straight giving the clouds the appearance of a comma (
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that formed worldwide from 1985 to 2005. The points show the locations of the storms at six-hourly intervals and use the color scheme shown on the right from the
459:. It is 22 km long (North-South) and 5 km wide. Its dunes reach a maximum height of 150 meters. It is located roughly 40 kilometers south-east of
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and one of the most active in the whole entire world. This eruption, one of Etna's most vigorous in years, was triggered by a series of
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crystals and shaped like hairlike filaments. They are formed at an altitudes above 5000 metres (16,500 feet). The streaks are made of
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754:. Too cold and dry to support virtually any vascular plants, Antarctica's flora presently consists of around 250
499:. Thunderstorms have had a lasting and powerful influence on mankind. Romans thought them to be battles waged by
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of Earth. The image was recorded with an electronic still camera at 15:15:15 GMT, Dec. 21, 1999. (Credit:
347:, and nearly half of the world's marine waters are over 3000 m deep. This global, interconnected body of
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Astronauts aboard the Space
Shuttle Discovery recorded this rarely seen phenomenon of the full
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as a
Category 4 storm. This photograph of the eye of the hurricane was taken from a
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winter is the season having the shortest days (which vary greatly according to
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130:. The photo shows the geological exfoliation of granite dome rock. (Taken by
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into the following five bodies, from the largest to the smallest: the
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than is replenished by flow into that region. In this region of the
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is brown, sand is yellow and white, vegetation is green, and salty
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cover almost three quarters (71%) of the surface of the
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815:-covered glaciers and researchers have found a strong
709:, 600 km (373 mi) to the south. (Credit:
463:. The local center for tourists is the village of
8:
750:. Antarctica was discovered in late January
351:, called the World Ocean, is divided by the
379:. Official boundaries are defined by the
766:, and around 700 terrestrial and aquatic
624:was the third most powerful storm of the
503:. Thunderstorms were associated with the
250:. Now it is thought to be a symmetrical
566:) and the lowest temperatures. (Credit:
157:. (Credit: Oregon's Mt. Hood Territory.)
381:International Hydrographic Organization
25:
655:aircraft on August 28, 2005. (Credit:
320:and is used by pilots for calibrating
55:. (Credit: NASA, with image edits by
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746:and is almost entirely covered by
644:along the Central Gulf Coast near
640:on August 25, 2005, then again on
258:or dome) that has been exposed to
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693:. Etna is the largest of Italy's
527:This map shows the tracks of all
417:homeless due to Gafilo. (Credit:
120:Enchanted Rock State Natural Area
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469:Rosa Cabecinhas and Alcino Cunha
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294:, drawn on the desert floor at
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823:and glacial retreat. (Credit:
626:2005 Atlantic hurricane season
533:Saffir-Simpson Hurricane Scale
1:
314:Dryden Flight Research Center
705:was reported as far away as
671:An October 2002 eruption of
691:International Space Station
515:. (Credit: John Kerstholt.)
53:International Space Station
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190:partially obscured by the
799:from its terminus of the
646:Buras-Triumph, Louisiana
210:A true-color picture of
821:increasing temperatures
795:in which more material
511:to be a servant of the
744:coldest place on earth
695:three active volcanoes
385:Alexandre Van de Sande
297:Edwards Air Force Base
174:'s Earth Observatory.)
18:Portal:Earth sciences
558:of temperate zones.
316:, it is inclined to
290:The world's largest
218:to the west and the
689:, as seen from the
554:is one of the four
399:Satellite image of
274:are blue. (Credit:
134:on 2nd April 2005.)
35:A 2002 eruption of
770:species. (Credit:
322:heading indicators
242:in the country of
51:, viewed from the
621:Hurricane Katrina
529:tropical cyclones
308:. Painted on the
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734:surrounding the
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653:Hurricane Hunter
632:as a Category 1
628:. It first made
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587:are composed of
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365:Atlantic Ocean
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149:reflected in
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132:Wing-Chi Poon
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128:United States
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711:Expedition 5
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568:Richard Fabi
513:Great Spirit
485:thunderstorm
400:
377:Arctic Ocean
369:Indian Ocean
357:archipelagos
295:
292:compass rose
57:User:Darkone
817:correlation
699:earthquakes
603:. (Credit:
535:. (Credit:
505:Thunderbird
467:. (Credit:
383:. (Credit:
324:. (Credit:
264:false-color
151:Mirror Lake
95:. (Credit:
93:Switzerland
764:liverworts
740:South Pole
727:Antarctica
685:island of
674:Mount Etna
601:turbulence
593:snowflakes
507:, held by
491:involving
438:Erg Chebbi
414:Madagascar
407:Category 5
375:, and the
353:continents
349:salt water
302:California
262:. In this
254:(circular
244:Mauritania
240:depression
192:atmosphere
147:Mount Hood
85:Einsiedeln
47:island of
37:Mount Etna
742:, is the
732:continent
642:August 29
634:hurricane
537:Nilfanion
493:lightning
276:Landsat 7
272:sediments
256:anticline
248:meteorite
220:Irish Sea
170:(Credit:
819:between
809:Himalaya
762:, 25-30
630:landfall
564:latitude
465:Merzouga
446:عرج شبّي
801:glacier
797:ablates
756:lichens
703:Ashfall
683:Italian
681:on the
679:volcano
556:seasons
501:Jupiter
497:thunder
457:Morocco
450:Saharan
268:bedrock
266:photo,
260:erosion
212:Ireland
118:in the
116:granite
87:in the
77:Sihlsee
73:meadows
45:Italian
43:on the
41:volcano
827:&
813:debris
805:Bhutan
760:mosses
758:, 100
730:, the
713:crew.)
687:Sicily
552:Winter
461:Erfoud
442:Arabic
371:, the
367:, the
363:, the
341:Oceans
252:uplift
155:Oregon
49:Sicily
768:algal
736:Earth
707:Libya
345:Earth
312:near
310:playa
238:is a
124:Texas
83:near
79:, an
16:<
829:USGS
825:NASA
772:NASA
752:1820
677:, a
657:NOAA
650:NOAA
495:and
423:NASA
355:and
326:NASA
234:The
196:NASA
188:Moon
172:NASA
39:, a
748:ice
738:'s
589:ice
455:in
453:erg
300:in
122:of
114:of
75:of
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774:.)
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