Terminology
This term refers to the top of the zone of saturation that supplies most wells.
Water Table
This is the source of energy that drives the hydrologic cycle by evaporating surface water.
The Sun
Worldwide, this sector claims about 70% of total water withdrawal.
Agriculture
This type of pollution comes from a specific location, such as a drain pipe or sewer outfall.
Point source
This 1972 Act sets a national goal for all U.S. surface waters to be "fishable and swimmable".
Clean Water Act
In the game of chess, this is the only piece that can move in an "L" shape.
The knight
This is the land area drained by a particular stream or river.
Water shed
Only this approximate percentage of all water on Earth is fresh.
2.4%
It takes approximately 15,000 to 16,000 liters of water to produce one kilogram of this food.
Beef
This natural material is considered the largest source of water pollution in the U.S..
Silt and sediment
This inland sea in Central Asia collapsed after its feeder rivers were diverted for irrigation.
Aral Sea
A group of these "dark" birds is famously known as a "murder."
Crows
These are porous layers of sand, gravel, or rock that contain groundwater.
Aquifer
Nearly 90% of Earth’s freshwater is tied up in these three locations.
Glaciers, ice caps, and snowfields
This specific food item requires the most water to produce, at 28,000 liters per kilogram.
Chocolate
This process occurs when human activities greatly accelerate nutrient enrichment in water bodies.
Cultural eutrophication
This level of municipal treatment uses aerobic bacteria to break down dissolved organic compounds.
Secondary Treatment
In the U.S., a man cannot legally marry his widow's sister for this specific reason.
Because he's dead
This concept describes the length of time a water molecule typically stays in a specific compartment.
Residence time
This compartment contains only 0.001% of total water but is the most important for global redistribution.
The atmosphere
This is the number of gallons per person per year the WHO considers necessary for modern needs.
264,000 gallons
This heavy metal, often from coal plants, is the most widespread toxic contaminant in North America.
Mercury
This term refers to the use of living organisms, such as plants or bacteria, to clean contaminated water.
Bioremediation
This carbonated beverage was originally marketed as a nerve tonic and was invented in Atlanta, Georgia.
Coca-cola
This is the sinking of the ground surface that can occur when groundwater is over-pumped.
Subsidence
This is the specific name for the shallow layer of soil containing both air and water above the water table.
Zone of aeration
According to the resources, there have been at least this many military confrontations over water in the past 50 years.
37 Military conflicts
This measurement (BOD) refers to the amount of dissolved oxygen consumed by aquatic microorganisms.
Biochemical Oxygen Demand
This is the largest water diversion project in the world, currently located in China.
Three Gorges Dam
This is the only sport to have been played on the surface of the moon.
Golf