

A scientist samples groundwater at a mine site for chemical analysis. |
A biologist takes samples to test water quality. |
A paleobiologist participates in the first geologic mapping of Seymour Island in Antarctica to learn about ancient climates. |
A geologist examines deposits from the 1989-90 eruption of Alaska's Redoubt Volcano |
With the aid of a computer and a microscope, scientists analyze rock and sediment samples collected from the ocean floor |
A seismologist analyzes seismic data from earthquakes as they occur |
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This booklet was originally published and printed in 1999. The online edition contains full text from the original publication. Some images have been modified or added to improve the scientific visualization of information. This document has undergone official review and approval for publications established by the National Mapping Division, U.S. Geological Survey.
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