where large rivers carry the largest part of their load
What is in suspension?
100
creates surface currents
What is wind?
100
A body of permeable rock that can contain or transmit groundwater.
What is an aquifer?
100
sewage, landfills, and highway salt are all common sources of __________________ for aquifers
What is pollutants/pollution/contaminates?
100
Government agency assigned the task of repairing the damage already done to the natural environment and to establish new criteria to guide Americans in making a cleaner environment a reality.
What is the Environmental Protection Agency (EPA)?
200
powers the hydrologic cycle
What is the sun?
200
warm, freshwater is much ______ dense than cold, salty water
What is less?
200
The percentage of the total volume of rock or sediment that consists of voids or spaces
What is porosity?
200
Pollutants discharged from any identifiable point, including popes, ditches, channels, sewers, tunnels, and containers of various types.
What is point source pollution?
200
artificial levees are built along a river to control this
What is flooding?
300
Freshwater is ____ percentage of all water on earth.
What is 3?
300
the process by which warm, less-dense surface water is drawn away from along a shore by offshore currents and replaced by cold, denser water brought up from the subsurface.
What is upwelling?
300
the upper limit of the zone of saturation
What is the water table?
300
True or false? Fertilizers improve groundwater quality providing nutrients necessary for irrigation and drinking supplies.
What is false?
300
The process of bringing back to existence, or reestablishing, the original condition of a degraded environment.
What is restoration?
400
Since the water cycle is balanced, the average annual precipitation worldwide must equal the quantity of water that is ___________.
What is evaporated?
400
Oceans are _______ percentage of all water on earth.
What is 97?
400
the zone in the ground where all of the open spaces in sediment and rock are completely filled with water
What is the zone of saturation?
400
When the amount of water available to recharge the aquifer is significantly less than the amount being withdrawn, groundwater is considered a ______ resource.
What is nonrenewable?
400
The addition of water to rivers or to aquifers by natural infiltration, that tends to raise the water table.
What is recharge?
500
The five "ation" words related to the hydrologic cycle
What is transpiration, evaporation, condensation, precipitation, and infiltration.
500
three factors affecting/creating density currents (yes, THREE! - this is why it is worth 500 points!)
What is depth of water, temperature of water, and salinity?
500
area in the ground where all of the open spaces in sediment and rock are not completely filled with water
What is the zone of aeration?
500
the greatest single use of pumped groundwater from wells in the United States
What is irrigation (agriculture)?
500
the primary federal law in the United States governing water pollution; passed in 1972, the act established the goals of eliminating releases of high amounts of toxic substances into water, eliminating additional water pollution, and ensuring that surface waters would meet standards necessary for human sports and recreation