Broad term for all science related to the study of the earth.
An overview of coastal land loss with emphasis on the southeastern United States [ More info] Comprehensive background information on coastal land loss, discussing the influence of waves and storms, the intrinsic characteristics of the shoreline materials, and the role of human activities.
An Overview of Historical Channel Adjustment and Selected Hydraulic Values in the Lower Sabine and Lower Brazos River Basins, Texas and Louisiana [ More info] How has the channel shape and path changed in response to reservoirs and other human disturbances affecting the streamflow?
An Overview of the GIS Weasel [ More info] Software system designed to aid users in preparing spatial information as input to lumped and distributed parameter environmental simulation models.
ANALOG: a program for estimating paleoclimate parameters using the method of modern analogs [ More info] Scientific software used with faunal or floral census data to find the modern locations most similar to any given fossil assemblage. Source code is included.
Analyzing land use change in urban environments [ More info] Describes the USGS Urban Dynamics Research Program that studies landscape changes resulting from the growth of metropolitan regions over time.
Annual hydrologic data report of Pennsylvania [ More info] Online annual reports (since 1999) documenting hydrologic data for Pennsylvania gathered from USGS surface water and ground water data-collection networks and information on ordering paper copies of previous years.
ANSS - Advanced National Seismic System [ More info] Nationa network of seismic monitoring stations coordinated with a variety of regional organizations and academic institutions.
Application of the SPARROW watershed model to describe nutrient sources and transport in the Missouri River Basin [ More info] Maps and diagrams showing how the mathematical model predicts the distribution of various pollutants within a large watershed.
Aquifer basics [ More info] Links to general information on water supply by aquifers based on rock types and to principal national aquifers by name.
Arctic National Wildlife Refuge, 1002 Area, petroleum assessment, 1998, including economic analysis [ More info] Arctic National Wildlife Refuge (ANWR) 1002 area's petroleum resource assessment. Text available in PDF and HTML formats.
Alphabetical Index of Topics
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