alleryWhat is very old groundwater, which can stay below ground over 10,000 years, called?
ASoil moisture
BSurface water
CFossil water
DRunoff water
Answer & Solution
Correct answer: C. Fossil water
1. Groundwater can spend over 10,000 years underground.
2. Particularly old groundwater is called fossil water.
3. Soil moisture and runoff are short-lived by comparison.
_Source: Wikipedia, Water cycle, Residence times_
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