Science Topics term usage 2007-05-04

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.)

137	river systems
82	geographic information systems (GIS)
78	volcanoes
72	earthquakes
32	earthquake occurrences
27	climate change
27	tectonic processes
21	surface water (non-marine)
20	stream discharge
19	global warming
16	acid deposition
16	animals
15	stream-gage measurement
15	water quality
14	geologic history
14	earth structure
14	real-time monitoring and reporting
14	topography
13	mineral resources
12	maps and atlases
12	water chemistry
12	sediment transport
12	streamflow
11	volcanic activity
11	oil resources
11	aquatic ecosystems
11	rocks and deposits
10	drainage basins
10	magnetic field (earth)
10	ground water
10	ecosystems
10	sedimentation
10	endangered species
10	human impacts
9	water supply and demand
9	planetary bodies
9	invasive species
9	tsunamis
9	hydrology
9	hurricanes

Science Topics term usage Friday, 2007-05-04