Science Topics term usage 2007-05-01

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.)

180	river systems
132	volcanoes
93	geographic information systems (GIS)
86	earthquakes
37	tectonic processes
30	ground water
30	water resources
29	contamination and pollution
29	earthquake occurrences
28	acid deposition
26	earth structure
24	streamflow
23	human impacts
23	stream discharge
23	energy resources
22	geologic structure
21	tsunamis
20	magnetic field (earth)
19	floods
19	climate change
17	water quality
17	hurricanes
16	mineral resources
15	volcanic activity
15	erosion
15	aerial photography
15	birds
14	global change
14	sea-floor characteristics
14	hazards
14	surface water (non-marine)
14	topography
14	real-time monitoring and reporting
14	animals
14	health and disease
14	endangered species
13	hydrology
13	topics
13	natural gas resources
12	freshwater ecosystems

Science Topics term usage Tuesday, 2007-05-01