Assertion: krypton's isotope | /r/ObjectUse | used in combination
Facets:
value: as in aquifers
type: LOCATION
value: under the correct hydrologic conditions
type: OTHER
Source sentences:
text: Under the correct hydrologic conditions (as in aquifers that have high permeablility or shallow circulation), isotopes can be used in combination to trace groundwater flow paths and verify flow models.