Science Topics term usage 2007-06-20

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.)

108	geographic information systems (GIS)
84	water properties
56	earthquakes
38	volcanoes
33	earthquake occurrences
22	streamflow
21	spatial analysis
17	hydrology
15	ground-water flow
15	climate change
14	tectonic processes
14	animals
14	earth structure
13	surface water (non-marine)
13	maps and atlases
13	erosion
13	human impacts
12	water hardness
12	mineral resources
12	drainage basins
12	nutrient content (water)
11	ground water
11	water resources
11	wildlife
10	rocks and deposits
10	water quality
10	mathematical modeling
10	acid deposition
9	aerial photography
9	volcanic activity
9	energy resources
9	laboratory methods
9	geologic history
9	geologic structure
9	water chemistry
9	tsunamis
9	coal resources
9	contamination and pollution
8	geolocation measurement
8	floods

Science Topics term usage Wednesday, 2007-06-20