Science Topics term usage 2007-12-12

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.)

69	ground-water quality
68	geographic information systems (GIS)
57	earthquakes
31	earthquake occurrences
22	human impacts
21	acid deposition
20	volcanoes
19	tectonic processes
19	climate change
18	ground-water level
16	earth structure
16	endangered species
15	mineral resources
15	tsunamis
15	stream-gage measurement
14	snow and ice cover
14	contamination and pollution
13	ground water
13	global warming
13	floods
12	land use and land cover
12	water chemistry
12	water quality
12	precipitation (atmospheric)
11	water cycle
11	ground-water flow
10	landslides
10	geologic history
10	global change
10	plants (organisms)
10	aquatic ecosystems
10	sediment transport
10	erosion
10	rocks and deposits
10	animals
9	river systems
9	ocean characteristics
9	desert ecosystems
9	water properties
9	water resources

Science Topics term usage Wednesday, 2007-12-12