Keywords: Physical Geography (823)

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Africa: Showing the Changing Seasons
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Africa: Showing the Changing Seasons

SeaWiFS false color data showing seasonal change in the oceans and on ... (more)

SeaWiFS false color data showing seasonal change in the oceans and on land for Africa. The data is seasonally averaged, and shows spring, summer, fall, winter, spring, summer, and fall. (less)

Subject:
Science and Technology
Material Type:
Other
Provider:
NASA
UCAR Staff
Provider Set:
NASA GSFC Scientific Visualization Studio
Scientific Visualization Studio
Author:
Gene Feldman
Jesse Allen
Marte Newcombe
African Vegetation: Comparing August 1984 and August 1994
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African Vegetation: Comparing August 1984 and August 1994

For many years, scientists have believed that the southern expansion of the ... (more)

For many years, scientists have believed that the southern expansion of the Sahara has been due to human activity. However, results from the AVHRR instrument and its measurements of vegetation suggest a different explanation: rainfall patterns. In drier years (1984 was one of the driest summers in recorded history in Northern Africa), the Sahara expands south, but in wetter years (such as 1994), vegetation moves back and there is no net expansion of the Sahara as had been previously suggested. (less)

Subject:
Science and Technology
Material Type:
Other
Provider:
NASA
UCAR Staff
Provider Set:
NASA GSFC Scientific Visualization Studio
Scientific Visualization Studio
Author:
Compton Tucker
Jesse Allen
Sharon Nicholson
African Vegetation: Comparing July 1984 and July 1994
No Strings Attached

African Vegetation: Comparing July 1984 and July 1994

For many years, scientists have believed that the southern expansion of the ... (more)

For many years, scientists have believed that the southern expansion of the Sahara has been due to human activity. However, results from the AVHRR instrument and its measurements of vegetation suggest a different explanation: rainfall patterns. In drier years (1984 was one of the driest summers in recorded history in Northern Africa), the Sahara expands south, but in wetter years (such as 1994), vegetation moves back and there is no net expansion of the Sahara as had been previously suggested. (less)

Subject:
Science and Technology
Material Type:
Other
Provider:
NASA
UCAR Staff
Provider Set:
NASA GSFC Scientific Visualization Studio
Scientific Visualization Studio
Author:
Compton Tucker
Jesse Allen
Sharon Nicholson
African Vegetation: Comparing September 1984 and September 1994
No Strings Attached

African Vegetation: Comparing September 1984 and September 1994

For many years, scientists have believed that the southern expansion of the ... (more)

For many years, scientists have believed that the southern expansion of the Sahara has been due to human activity. However, results from the AVHRR instrument and its measurements of vegetation suggest a different explanation: rainfall patterns. In drier years (1984 was one of the driest summers in recorded history in Northern Africa), the Sahara expands south, but in wetter years (such as 1994), vegetation moves back and there is no net expansion of the Sahara as had been previously suggested. (less)

Subject:
Science and Technology
Material Type:
Other
Provider:
NASA
UCAR Staff
Provider Set:
NASA GSFC Scientific Visualization Studio
Scientific Visualization Studio
Author:
Compton Tucker
Jesse Allen
Sharon Nicholson
Alaska: A Bird's Eye View
Read the Fine Print

Alaska: A Bird's Eye View

In this web-based, interactive story, Tutangiaq (Too-tang-geye-ack - nicknamed 2T), a Canada ... (more)

In this web-based, interactive story, Tutangiaq (Too-tang-geye-ack - nicknamed 2T), a Canada Goose, flies across Alaska looking for his family. As he flies, he tells children about the fascinating 49th state. Children learn how Alaska was purchased from the Russians, and other facts about the state. They can also compare the size of Alaska to other states. 2T takes a flight across the volcanic chain in Alaska and helps the students to interactively explore how scientists monitor volcanoes from satellite images in near-real time. At the coast, the bird also meets his Walrus friend who shows him how the sea ice edge has receded and gives an example of an adverse effect on marine life. Finally, 2T arrives in Fairbanks where children use satellite imagery to help 2T find and unite with his family. (less)

Subject:
Chemistry
Geoscience
Physics
Space Science
History, Law, Politics
Technology
Life Science
Ecology
Forestry and Agriculture
Science and Technology
Social Sciences
Material Type:
Activities and Labs
Data
Images and Illustrations
Instructional Material
Interactive
Reference
Textbooks
Provider:
Alaska Space Grant Program
UCAR Staff
University Corporation for Atmospheric Research
Provider Set:
Alaska Space Grant Program
NASA Earth and Space Science Reviewed Collection
DLESE Community Collection
All About Glaciers
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All About Glaciers

This site has something for everyone, from glaciologists to grade school students. ... (more)

This site has something for everyone, from glaciologists to grade school students. It explores nearly all aspects of glaciers and includes data and science, facts, a gallery, and a glossary. (less)

Subject:
Chemistry
Geoscience
Physics
Space Science
Social Sciences
Material Type:
Images and Illustrations
Reference
Provider:
UCAR Staff
Provider Set:
Digital Water Education Library (DWEL)
Author:
Richard Armstrong
Aquifer Basics
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Aquifer Basics

This USGS site explains what an aquifer is and defines the different ... (more)

This USGS site explains what an aquifer is and defines the different types of aquifers based on six principal lithologies; sandstone, carbonate, sandstone-carbonate, igneous and metamorphic, sand and gravel, and other rock types. The site features maps and descriptions of the major aquifers in the United States as well as general information about groundwater occurrence and quality. The site also provides links to additional maps and data about specific aquifers across the nation. (less)

Subject:
Science and Technology
Material Type:
Readings
Provider:
USGS
Provider Set:
USGS
Araona Crater (Iturralde Structure)
No Strings Attached

Araona Crater (Iturralde Structure)

The Araona Crater (also known as the Iturralde Structure) is a suspected ... (more)

The Araona Crater (also known as the Iturralde Structure) is a suspected crater from an impactor which struck northern Bolivia approximately 20,000 years ago. The feature is believed to have been caused by a short period comet striking at 70 kilometers per second and splattering into the muddy alluvial flood plain in the Lower Amazon jungle. The impact created a circular depression which is now roughly 8 kilometers across and 3 meters deep. The structure was discovered in 1988 Landsat data, but was not visited successfully until 1998 because the region is inaccessible. Future expeditions hope to finally settle if the feature truly is the impact crater it appears to be, and if so, determine the nature of the impactor. The full Landsat scene of Northern Bolivia includes the Rio Bene running northward through the image (North is up), with the Rio Madidi running across the image from southwest towards the northeast before joining the Rio Bene. The image was constructed from Landsat Thematic Mapper bands 7, 5, and 3 displayed as red, green, and blue respectively. The green tone of the image distinguishes between different types of vegetation with low scrubland in the alluvial flood plain appears as a light green and dense tropical jungle coverage appearing dark green. The close-up of the impact crater uses the same Landsat data, but passed through a sharpening image filter which emphasizes high spatial frequency features and tends to enhance color contrast. (less)

Subject:
Science and Technology
Material Type:
Other
Provider:
NASA
UCAR Staff
Provider Set:
NASA GSFC Scientific Visualization Studio
Scientific Visualization Studio
Author:
Darrel Williams
Jesse Allen
Asia: Showing the Changing Seasons
No Strings Attached

Asia: Showing the Changing Seasons

SeaWiFS false color data showing seasonal change in the oceans and on ... (more)

SeaWiFS false color data showing seasonal change in the oceans and on land for Asia. The data is seasonally averaged, and shows the sequence: fall, winter, spring, summer, fall, winter, spring (for the Northern Hemisphere). (less)

Subject:
Science and Technology
Material Type:
Other
Provider:
NASA
UCAR Staff
Provider Set:
NASA GSFC Scientific Visualization Studio
Scientific Visualization Studio
Author:
Gene Feldman
Jesse Allen
Marte Newcombe
Atlanta Flyby with Opening Labels (542)
No Strings Attached

Atlanta Flyby with Opening Labels (542)

Atlanta with opening labels (542). This scene shows Landsat Thematic Mapper data ... (more)

Atlanta with opening labels (542). This scene shows Landsat Thematic Mapper data from the shortwave infrared (TM band 5), infrared (TM band 4), and visible green( TM band 2) channels of Atlanta. (less)

Subject:
Science and Technology
Material Type:
Other
Provider:
NASA
UCAR Staff
Provider Set:
NASA GSFC Scientific Visualization Studio
Scientific Visualization Studio
Author:
Darrel Williams
Jesse Allen
2002 llaF ,gnivloS melborP gnireenignE dna sretupmoC ot noitcudortnI

2002 llaF ,gnivloS melborP gnireenignE dna sretupmoC ot noitcudortnI

.desu si egaugnal gnimmargorp avaJ ehT .gninnalp dna ,tnemeganam ,ecneics ,gnireenigne ni ... (more)

.desu si egaugnal gnimmargorp avaJ ehT .gninnalp dna ,tnemeganam ,ecneics ,gnireenigne ni smelborp gnivlos rof seuqinhcet gnipoleved no si sisahpmE .scipot decnavda detceles dna scihparg retupmoc ,gnihcraes dna gnitros ,serutcurts atad ,sdohtem laciremun ,secafretni resu lacihparg ,stpecnoc gnimmargorp revoc smelborp gnimmargorp ylkeeW .esruoc eht fo sucof eht si tnempoleved dna ngised erawtfos detneiro-tcejbO .snoitacilppa cifitneics dna gnireenigne rof sdohtem lanoitatupmoc dna tnempoleved erawtfos latnemadnuf stneserp esruoc sihT (less)