This site provides background information about the relationship between ocean currents and surface winds. There are links to images, JPL missions and instruments, and an El Nino site. Full description.

Visitors can use sea surface temperature data to build animations that show seasonal and yearly fluctuations, and compare them to data from other selected months and years. The animations can be constructed in map or globe formats and may be viewed on the website or downloaded. Full description.

The friction produced by winds blowing towards the equator on the ocean's surface, together with the effect of the earth's rotation, cause water in the surface layer to move away from the western coast of continental land masses. This offshore moving water is replaced by water which upwells, or flows toward the surface from depths of 50 to 100 meters and more. Users can view an illustration and read ... Full description.

This resource offers access to a variety of materials, including general information about COOL, a photo gallery, press releases, talks and papers, and research projects. There are links to archived and real-time ocean data (sea surface temperature, surface currents and waves, autonomous glider data), and an "underwater weather forecast". Full description.

This site discusses the loss of ice from the West Antarctic Ice Sheet, which has been observed for the last thirty years. Topics include why, when, and how much ice was lost by the ice sheet since the last glacial maximum, and whether the ice sheet was ever smaller than it is today. Full description.

This site, originally published as part of NASA's History Series, presents a detailed history of the Apollo program. The story begins in the 1950s with early efforts to beat the Soviet Union into space, carries through the Kennedy administration, with its famous challenge to land a man on the moon and return him safely to Earth by the end of the 1960s, and culminates with the landing of Apollo 11 ... Full description.

The most profound deformational event involving the interaction of lithospheric plates is a collision between continents; for example, the collision of the Indian continent with the Eurasian continent, which began in the Eocene. This continuing collision has produced intracontinental thrust sheets responsible for the highest mountains in the world. Mount Everest, the Annapurna Range, and the rest ... Full description.

The Landsat Thematic Mapper is a multispectral imaging sensor added to Landsats 4 and later. This site uses text, photographs, tables, and diagrams to explain how the Thematic Mapper works and the advantages of sensing radiation in wavelengths other than those normally visible to the human eye. It is part of NASA's Remote Sensing Tutorial and links to the rest of the tutorial are provided. Full description.

Appalachian Mountain landforms clearly demonstrate the relation of plate tectonics and structure to geomorphology. The folded rocks record the convergence of two continental plates in Pennsylvanian/Permian time. This page uses text, maps, and remotely sensed imagery to explain the relationship between plate tectonics, geologic structures, and the resulting landforms. It is part of an out-of-print ... Full description.

The mental picture of the Appalachian Mountains most of us have is that of long linear ridges and valleys that form a belt some 25 to 100 km wide through Pennsylvania/Virginia/West Virginia and the Carolinas. With relief of 300 to 1000 m or more, these ridges stand out as distinct mountains. This page describes the general geomorphology and geology of the Appalachian Mountains with the use of text ... Full description.