Science Topics term usage 2007-04-24

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.)

184	river systems
124	volcanoes
117	geographic information systems (GIS)
109	earthquakes
37	earthquake occurrences
34	climate change
27	tectonic processes
26	floods
25	hydrology
25	acid deposition
25	earth structure
24	stream discharge
23	contamination and pollution
22	energy resources
21	rocks and deposits
20	tsunamis
19	animals
19	precipitation (atmospheric)
18	global warming
18	ground-water flow
18	oil resources
17	aerial photography
17	human impacts
17	landslides
16	streamflow
16	ecosystems
16	geologic history
15	maps and atlases
15	surface water (non-marine)
15	endangered species
14	land use and land cover
14	global change
14	sedimentation
14	water resources
13	remote sensing
13	hurricanes
13	hazards
13	sediment transport
13	erosion
12	geologic structure

Science Topics term usage Tuesday, 2007-04-24