Science Topics term usage 2007-04-30

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.)

172	river systems
120	volcanoes
111	earthquakes
91	geographic information systems (GIS)
42	earthquake occurrences
36	acid deposition
35	climate change
34	earth structure
28	tectonic processes
25	contamination and pollution
23	animals
20	stream discharge
19	topography
18	cartography
18	rocks and deposits
18	ground water
18	erosion
17	map coordinate systems
17	health and disease
17	tsunamis
17	water resources
16	hurricanes
16	oil resources
16	geologic history
16	surface water (non-marine)
16	endangered species
16	streamflow
15	human impacts
15	landslides
15	floods
14	mineral resources
14	energy resources
14	global warming
13	ecological competition
13	ocean characteristics
13	land use and land cover
12	land surface characteristics
12	hazards
12	geospatial datasets
12	mining hazards

Science Topics term usage Monday, 2007-04-30