LSU Geography Exam #2 Namikas, GEOG 2051 Namikas
Test 2 Updated New|2026
Salt water
What type of water makes up 97% of earth's water?
97%
Salt water makes up _______% of earth's water
Fresh water
What type of water makes up 3% of earth's water?
3%
Fresh water makes up ______% of earth's water
20%
What percentage of freshwater is ground water?
50%
What percentage of all ground water is shallow ground water and can be used?
50%
What percentage of all ground water is deep ground water and is unusable?
80%
What percentage of fresh water is on the surface of the earth?
99%
What percentage of surface freshwater is ice?
Less than 1%
What percentage of surface freshwater is lakes, rivers, etc?
99%
Ice makes up ___% of all surface freshwater
,Sublima*on
A direct change in state from solid to a gas or a gas to a solid... skips the liquid phase
Ver*cal movements
Movements that involve li0ing and precipita*on
Horizontal movements
Movements that involve runoff and advec*on
True: Budgets maintain the global balance so the total amount of water stays constant over *me
T or F: The overall amount of water stays rela*vely constant over *me
Reservoirs
Places that hold water
Residence *me
Average amount of *me water will spend in the reservoir
A few days (very short)
What is the residence *me for water in the atmosphere?
A few weeks (short)
What is the residence *me for water in rivers?
Years / Decades (long)
What is the residence *me for water in lakes?
Thousands of years (very long)
What is the residence *me for water in oceans?
Aquifer
Porous substance that holds water
Aquiclude
Body of impermeable material that water can't penetrate
Saturated zone
The term for when the pore space of an aquifer is filled with water
, Zone of aera*on
The term for when the pore space of an aquifer is filled with air
Water table
The eleva*on that water will rise to naturally if a well is drilled
Recharge rate
Rate at which new water is coming in to aquifer
Confined aquifer
If an aquifer is sandwiched in between 2 aquicludes and water can't travel down to the aquifer
Unconfined aquifer
Rain water can travel down freely to the aquifer and it can seep through the ground
Groundwater mining
Groundwater is taken out faster than it is replaced and the water table drops
Water table drawdown
Another name for groundwater mining
Aquifer collapse
This occurs when the pore spaces fill with air when the water table drops down and the air gets
compressed
Pollu*on
This occurs when landfills / sep*c systems leak in to an aquifer
Cone of depression
Occurs in an aquifer when groundwater is pumped from a well
Saltwater intrusion
The movement of saline water in to freshwater aquifers
Drainage basin
A land area that supplies water to a par*cular river system
Watershed
Test 2 Updated New|2026
Salt water
What type of water makes up 97% of earth's water?
97%
Salt water makes up _______% of earth's water
Fresh water
What type of water makes up 3% of earth's water?
3%
Fresh water makes up ______% of earth's water
20%
What percentage of freshwater is ground water?
50%
What percentage of all ground water is shallow ground water and can be used?
50%
What percentage of all ground water is deep ground water and is unusable?
80%
What percentage of fresh water is on the surface of the earth?
99%
What percentage of surface freshwater is ice?
Less than 1%
What percentage of surface freshwater is lakes, rivers, etc?
99%
Ice makes up ___% of all surface freshwater
,Sublima*on
A direct change in state from solid to a gas or a gas to a solid... skips the liquid phase
Ver*cal movements
Movements that involve li0ing and precipita*on
Horizontal movements
Movements that involve runoff and advec*on
True: Budgets maintain the global balance so the total amount of water stays constant over *me
T or F: The overall amount of water stays rela*vely constant over *me
Reservoirs
Places that hold water
Residence *me
Average amount of *me water will spend in the reservoir
A few days (very short)
What is the residence *me for water in the atmosphere?
A few weeks (short)
What is the residence *me for water in rivers?
Years / Decades (long)
What is the residence *me for water in lakes?
Thousands of years (very long)
What is the residence *me for water in oceans?
Aquifer
Porous substance that holds water
Aquiclude
Body of impermeable material that water can't penetrate
Saturated zone
The term for when the pore space of an aquifer is filled with water
, Zone of aera*on
The term for when the pore space of an aquifer is filled with air
Water table
The eleva*on that water will rise to naturally if a well is drilled
Recharge rate
Rate at which new water is coming in to aquifer
Confined aquifer
If an aquifer is sandwiched in between 2 aquicludes and water can't travel down to the aquifer
Unconfined aquifer
Rain water can travel down freely to the aquifer and it can seep through the ground
Groundwater mining
Groundwater is taken out faster than it is replaced and the water table drops
Water table drawdown
Another name for groundwater mining
Aquifer collapse
This occurs when the pore spaces fill with air when the water table drops down and the air gets
compressed
Pollu*on
This occurs when landfills / sep*c systems leak in to an aquifer
Cone of depression
Occurs in an aquifer when groundwater is pumped from a well
Saltwater intrusion
The movement of saline water in to freshwater aquifers
Drainage basin
A land area that supplies water to a par*cular river system
Watershed
