Science Topics term usage 2007-05-07

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.)

222	river systems
99	earthquakes
77	geographic information systems (GIS)
75	volcanoes
36	earthquake occurrences
31	stream discharge
29	earth structure
25	acid deposition
24	contamination and pollution
22	energy resources
22	geologic history
22	climate change
21	ground-water flow
20	streamflow
19	hydrology
17	surface water (non-marine)
16	ocean characteristics
16	hazards
16	mineral resources
15	tsunamis
15	tectonic processes
15	animals
14	floods
14	rocks and deposits
14	endangered species
13	ground water
13	cartography
13	magnetic field (earth)
13	global change
12	river reaches
12	water quality
12	life sciences
12	stream-gage measurement
12	health and disease
11	natural gas resources
11	human impacts
10	tornadoes
10	biostratigraphy
10	sediment transport
10	geologic structure

Science Topics term usage Monday, 2007-05-07