Science Topics term usage 2007-04-26

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.)

212	river systems
96	earthquakes
92	volcanoes
88	geographic information systems (GIS)
31	stream discharge
31	rocks and deposits
30	acid deposition
29	earth structure
28	animals
28	climate change
26	tsunamis
25	floods
24	ground water
24	streamflow
23	earthquake occurrences
21	hurricanes
20	water resources
19	geologic history
18	surface water (non-marine)
18	global warming
17	tectonic processes
16	map coordinate systems
16	endangered species
16	water quality
16	water use
15	erosion
15	sediment transport
15	water supply and demand
15	aerial photography
15	human impacts
14	precipitation (atmospheric)
14	land use and land cover
14	mineral resources
13	biodiversity
13	energy resources
13	ground-water flow
12	global change
12	land surface characteristics
12	ocean characteristics
11	drainage basins

Science Topics term usage Thursday, 2007-04-26