Science Topics term usage 2007-04-18

This analysis excludes the activity of search-engine spiders, USGS users, and transactions resulting in errors.

(Table shows only the 40 most frequently chosen terms.)

273	river systems
130	volcanoes
123	earthquakes
100	geographic information systems (GIS)
39	earthquake occurrences
28	streamflow
28	floods
28	stream discharge
28	earth structure
26	water quality
26	mineral resources
25	tectonic processes
23	contamination and pollution
21	climate change
21	aerial photography
20	acid deposition
19	ground water
19	tsunamis
19	maps and atlases
18	endangered species
17	energy resources
16	human impacts
16	stream-gage measurement
15	drainage basins
15	magnetic field (earth)
15	rocks and deposits
14	surface water (non-marine)
14	invasive species
14	hydrology
14	ground-water flow
14	seismology
14	coastal zones
13	geologic history
13	land use and land cover
13	topics
12	earth characteristics
12	oil resources
12	real-time monitoring and reporting
12	water supply and demand
11	landslides

Science Topics term usage Wednesday, 2007-04-18