Which conditions give water the best cleaning effect on the way to becoming groundwater?
What happens if groundwater is depleted too fast?
Initially, water is driven underground by gravity. What is the main driver after a certain depth?
In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?
Test results
Congratulations. You have passed the test and completed the 92 - Understanding our groundwater
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Q: Can iron be precipitated from water flowing down through the subsurface?
A: Yes
Q: Can iron be precipitated from water flowing down through the subsurface?
A: No
Q: Can groundwater be over a thousand years old?
A: No
Q: Can groundwater be over a thousand years old?
A: Yes
Q: Which conditions give water the best cleaning effect on the way to becoming groundwater?
A: Fast travel time through the subsurface
Q: Which conditions give water the best cleaning effect on the way to becoming groundwater?
A: Slow travel time through the subsurface
Q: Which conditions give water the best cleaning effect on the way to becoming groundwater?
A: There is no cleaning effect through the subsurface
Q: What happens if groundwater is depleted too fast?
A: The land subsides and a shallow lake forms
Q: What happens if groundwater is depleted too fast?
A: The land subsides and dries out
Q: What happens if groundwater is depleted too fast?
A: Water pressure drops, but in principle the aquifer is always there
Q: Initially, water is driven underground by gravity. What is the main driver after a certain depth?
A: The main driver becomes pressure
Q: Initially, water is driven underground by gravity. What is the main driver after a certain depth?
A: The main driver is still gravity
Q: Initially, water is driven underground by gravity. What is the main driver after a certain depth?
A: Both pressure and gravity, depending on conditions
Q: In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?
A: 4 to 5 years
Q: In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?
A: Over a thousand years
Q: In the example given in the course, how many years will it take potentially for the effects of surface pollution to show up in drinking water?
A: 40 to 50 years