Science Topics term usage 2007-04-23

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.)

202	river systems
118	earthquakes
113	geographic information systems (GIS)
100	volcanoes
41	earthquake occurrences
38	climate change
36	maps and atlases
30	streamflow
28	hurricanes
27	tectonic processes
26	acid deposition
25	stream discharge
24	earth structure
21	hydrology
21	global warming
20	floods
20	energy resources
19	topography
18	ground water
18	ground-water flow
18	contamination and pollution
18	erosion
18	geologic history
17	animals
16	global change
16	water quality
15	tsunamis
15	invasive species
15	surface water (non-marine)
15	droughts
14	earthquake probabilities
14	rocks and deposits
14	marine geology
14	stream-gage measurement
13	endangered species
13	geologic structure
13	ocean characteristics
13	human impacts
13	landslides
12	coastal zones

Science Topics term usage Monday, 2007-04-23