The process whereby materials of the earth's crust are loosened, dissolved, or worn away and simultaneously moved from one place to another.
Missouri District Surface-Water Data & Analysis Section [ More info] Overview of the Surface-Water Data & Analysis Section of the Missouri District with links to real-time and historic water data, staff members, and projects on bridge scour and gaging station network.
National bridge scour database [ More info] Database with detailed data on sites and data collected on scour (downward erosion by streamflow) at bridges, piers, and abutments in the United States.
Sinkholes [ More info] Explains sinkhole formation and distribution, with special emphasis on their occurrence in Missouri
USGS news and information on El Nino [ More info] Information sources on El Nino effects such as landslides, coastal hazards, floods. Includes links to maps and images.
USGS Pacific coral reefs website [ More info] Overview of research in the Hawaiian Islands and Guam to gain insight into the structure of coral reefs, to provide the basis for future monitoring, and to understand the influences of natural processes and human activities on coral reef health.
Using terrestrial light detection and ranging (lidar) technology for land-surface analysis in the Southwest [ More info] Tripod-mounted lidar makes it inexpensive and efficient to measure and map geographic features that change with time, such as sand dunes and erosional features, and soil microtopography.
Yosemite Valley geologic story [ More info] Site describes the present understanding of the various geologic processes that contributed to the valley's creation. Links to Yosemite Valley's geologic maps.
Alphabetical Index of Topics
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