Env Finals 11/12
Water evaporates directly from plants as they breathe in a process called ____________________.
transpiration
____________________ ____________________ is the portion of a stream’s load transported along its bottom.
bed load
Ions dissolved in water are called ____________________ ____________________.
dissolved load
Low-gradient streams flow in a series of bends called ____________________.
meanders
A/An ____________________ ____________________ is a mound of sediment that accumulates on the inside of a meander.
point bar
____________________ is a measure of the speed at which water can travel through porous soil or bedrock.
Permeability
Excessive removal of ground water can cause ____________________, the sinking or settling of the Earth’s surface.
subsidence
____ percent of the Earth’s surface water is freshwater (found in streams, lakes, wetlands, ground-water reservoirs, and ice).
2.5
The region ultimately drained by a single river is a ____.
drainage basin
____ is the proportional volume of rock or soil that consists of open spaces.
porosity
During a flood, a stream overflows its banks, and water covers the adjacent ____.
flood plain
Caverns usually form in ____.
limestone
Most of the surface freshwater (in liquid or frozen form) is contained in:
ice sheets and glaciers
A stream’s erosional strength is:
greatest in a fast flowing stream
Domestic water use accounts for about ____ percent of all water used in the United States.
10
A/An ____ pollutant can be consumed and destroyed by organisms.
biodegradable
The largest use of water in the United States is for:
agriculture
If desert or semidesert soils are irrigated for long periods of time:
salt accumulates and destroys fertility
An example of nonpoint source of pollution is:
fertilizer spread over a farmers field
T/F. A stream erodes its bank most rapidly on the outside of a curve.
True
T/F. Levees can create conditions that cause much larger floods in the long term.
True
T/F. The water table does not fluctuate with the seasons.
False
T/F. Wetlands mitigate floods by absorbing excess water that might otherwise overrun towns and farms.
True
T/F. Most of the water in the Ogallala Aquifer accumulated during the Pleistocene.
True
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