Create an account
the contamination of air, water or soil by substances that are harmful to living organisms
the natural process of evaporation and condensation, driven by solar energy and gravity, that distributes the Earth's water as it evaporates from bodies of water
a form of water, such as rain, snow or sleet that condenses from the atmosphere and falls to the Earth's surface
the watershed, sub-watershed, and sub-sub-watershed that includes a particular location
the high ground where precipitation first collects and flows downhill in tiny trickles too small to create a permanent channel
the part of the stream where water collects to flow downstream, including the stream-bed, gravel bars and stream banks
water pollution that comes from a combination of many sources rather that a single outlet
a behavior or trait that increases a specie's chance of survival in a specific environment
a respiratory organ that enables aquatic animals to take oxygen from water and to excrete carbon dioxide
an organ running lengthwise down the sides of fish, used for detecting vibrations for pressure changes
a group of plants and animals living and interacting with one another in a particular place
the natural environment in which organisms normally live, including the surroundings and other physical conditions needed to sustain it
the act of actively seeking after and using an environmental resource (such as food) in limited supply by two or more plants or animals
an ecosystem's resource limit; the maximum number of individuals in a population that the ecosystem can support
an organism that is able to produce its own from non-living materials, and which serves as a food source for other organisms in a food chain
an organism such as bacterium or fungus that feeds on and breaks down dead plants or animals, making essential components available to other organisms
a graphical representation designed to show the relationship between energy and trophic levels of a given ecosystem
a group of organisms that occupy the same position in a food chain; each step of an energy pyramid
the natural process in which those organisms best adapted to the conditions under which they live survive and poorly adapted forms are eliminated
a community of organisms together with their physical environment and the relationships between them
a body of standing water small enough that sunlight can reach the bottom across the entire diameter
the shoulder-like sides of the stream channel from the water's edge to the higher ground nearby
land next to the stream, starting at the top of the bank, with heavy plant cover on either side
the flat land on both sides of a stream, into which the stream's extra water spreads during a flood
an aquatic animal that feeds by filtering tiny organisms or fine particles of organic matter from water that passes through it
the natural process by which sediment and organic material gradually replace the water volume of a pond
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together