Science Topics term usage 2007-04-20

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.)

170	river systems
107	geographic information systems (GIS)
98	earthquakes
71	volcanoes
33	earthquake occurrences
27	floods
21	tsunamis
21	animals
20	stream discharge
20	earth structure
20	mineral resources
19	tectonic processes
18	water quality
18	streamflow
17	hurricanes
17	energy resources
16	contamination and pollution
16	surface water (non-marine)
15	stream-gage measurement
14	ground water
14	water supply and demand
13	ground-water flow
13	droughts
13	climate change
12	map coordinate systems
12	landslides
12	hydrology
12	acid deposition
12	health and disease
11	water resources
11	industrial pollution
11	geologic history
11	wildlife
11	river reaches
10	metallic ores
10	birds
9	volcanic activity
9	coastal zones
9	fires
9	rocks and deposits

Science Topics term usage Friday, 2007-04-20