Science Topics term usage 2007-04-09

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.)

144	river systems
121	geographic information systems (GIS)
85	earthquakes
61	volcanoes
31	acid deposition
31	earthquake occurrences
27	energy resources
27	climate change
24	mineral resources
24	maps and atlases
23	drainage basins
23	streamflow
20	global warming
18	tectonic processes
18	oil resources
18	ecosystems
18	stream discharge
17	earth structure
16	tsunamis
16	animals
15	map coordinate systems
15	carbon isotope analysis
15	water quality
14	ground water
14	geography
14	contamination and pollution
13	precipitation (atmospheric)
13	geologic structure
13	industrial pollution
12	hydrology
12	water resources
12	land surface characteristics
12	surface water (non-marine)
11	ocean characteristics
11	field methods
11	invasive species
11	human impacts
11	planetary bodies
11	topics
11	rocks and deposits

Science Topics term usage Monday, 2007-04-09