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Photo ID: h2a8w7	Subject: Paleontology	Description
	Coelenterata; Corals; Cores; Growth Bands; Paleoclimatology; Pavona clavus	Coral skeleton formed in winter has a different density than that formed in summer because of variations in growth rates related to temperature and cloud cover conditions. Thus corals exhibit seasonal growth bands very much like those in trees. Sometimes these bands are visible to the naked eye; usually, however, they are more visible in an X-ray like this. When paleoclimatologists drill a coral core, they can count the growth bands and date samples exactly. Long cores can cover several hundred years; this portion of a core from Urvina Bay in the Galapagos Islands covers the period from 1716 to 1735 A. D. To best understand past climate, scientists need to be able to date their samples as accurately as possible. They need to know exactly when climatic changes occurred so that they can create realistic computer models of the global climate system.
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	South America; Ecuador; Galapagos Islands; Urvina Bay
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Photo ID: h4vk5w	Subject: Satellite Imagery	Description
	Clouds; Geologic Hazards; Hurricanes; Hydrosphere; Meteorology; Storms; Weather	Hurricane Alberto, the first hurricane of the 2000 season, sustained winds of 75 mph, and was classified as a relatively weak hurricane.
	Photographer	Location
	SeaWifs Credit Line: Copyright © NASA SeaWiFS Project	North America
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Photo ID: h4vli8	Subject: Satellite Imagery	Description
	Atolls; Basalt; Complexes; Geologic Regions; Hills; Igneous Rock; Islands; Landforms; Massifs; Mountains; Oceans; Plutonic Rocks; Seas	The island of Cyprus is seen in this image taken in 2001. This image shows the three distinctive geologic regions of the island including the Troodos Massif (mountains), the Kyrenia Range (thin arc), and the low lying Lefkosia region.
	Photographer	Location
	MODIS Credit Line: Courtesy MODIS, NASA	Asia; Cyprus; Cyprus Island
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Photo ID: h4vppi	Subject: Satellite Imagery	Description
	Fluvial Features; Geomorphology; Hydrogeology; Hydrology; Streams; Waterways	Images of the Nile River fluctuations near Khartoum, Sudan capturing the river's dynamic nature. These images show the river before and after the rainy seasons of 2000 and 2001. In these images it is possible to see the waters of the White Nile and Blue Nile converge and continue to flow northward as the Great Nile. The flooding in this area has dire consequences for the people living along the Nile. Image taken with the Terra Satellite's Multi-angle Imaging SpectroRadiometer (MISR) nadir camera.
	Photographer	Location
	NASAVE Credit Line: Courtesy NASA, Visible Earth	Africa; Sudan; Nubian Desert; Nile River
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Photo ID: h4vtgq	Subject: Satellite Imagery	Description
	Clouds; Coastlines; Seasons; Snow; Weather	This true-color image taken in June of 2001 shows snow retreating from much of Alaska. The blues, greens and browns in the water along the coasts are likely a mixture of phytoplankton and sediment running off from rivers. At upper right, you can see the Bering Strait continuing to thaw.
	Photographer	Location
	MODIS Credit Line: Courtesy MODIS, NASA	North America; United States; Alaska
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Photo ID: h4w4io	Subject: Glaciers	Description
	Annual Layers; Corew; Electrical Conductivity; Ice Caps; Ice Cores; Layers; Oxygen; Seasonal Variations; Visual Stratigraphy	Three deep core sections show distinct annual bands produced by the deposition of dust during the dry season (dry season dust layers are represented by triangles). While annual bands provide accurate relative dating (the age of each ice band is known to be a year apart from directly adjacent bands), paleoclimatologists also search for absolute dates within a core chronology. Electrical conductivity measurements (ECM), particle concentrations, and the ratio of heavy to light oxygen molecules are other seasonally-variable core parameters that can be used along with visual stratigraphy in dating ice cores.
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	South America; Peru; Altiplano; Quelccaya Ice Cap
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Photo ID: h4w4z8	Subject: Sedimentary Rocks	Description
	Accumulation Layers; Ice Caps; Ice Cores; Paleoclimatology; Visual Stratigraphy	The Quelccaya cap terminates abruptly and spectacularly in a 55 m ice cliff. The annual accumulation layers clearly visible in the photograph are an average of .75 m thick. While snow can fall during any season on the altiplano, most of it (80-90 percent) arrives between the months of November and April. The distinct seasonality of precipitation at Quelccaya results in the deposition of the dry season dust bands seen in the ice cliff. These layers are extremely useful to the paleoclimatologist because they allow ice core records to be dated very accurately using visual stratigraphy, which is simply the visual identification of annual dust layers in ice records
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	South America; Peru; Altiplano; Quelccaya Ice Cap
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Photo ID: h4w56o	Subject: Weather	Description
	Hurricane Allison; Hurricanes; Natural Hazards; Photometeorology; Remote Sensing; Satellite Imagery; Tropical Cyclones	This is a thermal infrared image of Hurricane Allison, the first named storm of the 1995 season. The 1995 Atlantic hurricane season was the second most active season in recorded history. During 1995, 12 named tropical cyclones formed in the Atlantic before the end of August, and by the end of the season 19 tropical cyclones had received names. 11 of the 19 reached hurricane strength. The 1886 to 1994 seasonal average is 8.4 tropical storms with 4.9 reaching hurricane strength.
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	Oceans; United States; North Atlantic; Hurricane Allison
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Photo ID: h4w596	Subject: Weather	Description
	Hurricane Allison; Hurricanes; Natural Hazards; Photometeorology; Remote Sensing; Satellite Imagery; Tropical Cyclones	This satellite image is a visible spectrum image of the first named storm of the 1995 season, Allison. The 1995 Atlantic hurricane season was the second most active season in recorded history. During 1995, 12 named tropical cyclones formed in the Atlantic before the end of August, and by the end of the season 19 tropical cyclones had received names. 11 of the 19 reached hurricane strength. The 1886 to 1994 seasonal average is 8.4 tropical storms with 4.9 reaching hurricane strength.
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	Oceans; United States; North Atlantic
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Photo ID: h4w5b7	Subject: Weather	Description
	Hurricanes; Natural Hazards; Photometeorology; Remote Sensing; Satellite Imagery; Tropical Cyclones	This satellite thermal infrared image is of Hurricane Erin in August of 1995. The 1995 Atlantic hurricane season was the second most active season in recorded history. During 1995, 12 named tropical cyclones formed in the Atlantic before the end of August, and by the end of the season 19 tropical cyclones had received names. 11 of the 19 reached hurricane strength. The 1886 to 1994 seasonal average is 8.4 tropical storms with 4.9 reaching hurricane strength.
	Photographer	Location
	NOAA Credit Line: Courtesy National Oceanic and Atmospheric Administration	North America; United States; Florida; Hurricane Erin
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