Science Topics term usage 2007-05-03

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.)

151	river systems
113	geographic information systems (GIS)
110	volcanoes
110	earthquakes
39	earthquake occurrences
32	acid deposition
32	energy resources
30	ground water
28	tectonic processes
28	stream discharge
27	geologic history
26	earth structure
24	climate change
24	hydrology
23	tsunamis
20	sea-floor characteristics
18	contamination and pollution
17	global warming
16	volcanic activity
16	erosion
16	water resources
16	rocks and deposits
16	floods
15	geologic structure
15	oil resources
15	hazards
15	mineral resources
14	ground-water flow
14	land surface characteristics
14	human impacts
14	stream-gage measurement
14	endangered species
14	global change
13	maps and atlases
13	ocean characteristics
13	hurricanes
13	bathymetry
13	topography
13	animals
13	land use and land cover

Science Topics term usage Thursday, 2007-05-03