Science Topics term usage 2007-04-12

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.)

163	river systems
117	geographic information systems (GIS)
111	earthquakes
61	volcanoes
35	earthquake occurrences
32	streamflow
25	energy resources
22	tectonic processes
22	rocks and deposits
21	global warming
21	surface water (non-marine)
21	animals
20	contamination and pollution
20	tsunamis
19	mineral resources
18	water quality
18	invasive species
18	acid deposition
18	floods
18	ground-water flow
17	earth structure
17	climate change
17	stream discharge
17	geologic history
16	maps and atlases
15	water resources
15	hydrology
15	natural gas resources
14	human impacts
13	ground-water quality
13	precipitation (atmospheric)
13	ground water
12	map coordinate systems
12	stream-gage measurement
12	marine geology
12	cartography
12	erosion
12	hurricanes
12	endangered species
12	aquatic ecosystems

Science Topics term usage Thursday, 2007-04-12