Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

21 Cards in this Set

  • Front
  • Back
Rock layers that contain water and will release it in appreciable quantites to wells or springs.
benthic division
Ocean or lake floor from the high-tide mark to the deepest depths; which supports a unique set of organisms.
biological magnification
Process by which substances become more concentrated in organisms in the higher trophic levels of a food web.
Plant that takes its nourishment from the air because its placement in other plants gives it an aerial position.
Conversion of nitrate or nitrite into nitrogen gas by bacteria in soil.
Organism that feeds on freshly desd or partially decomposed organic matter.
Protion of ocean located where a river enters fresh water and mixs with salt water.
Enrichment of water by inorganic nutrients used by phytoplankton; often overenrichment is caused by human activites leading to excessive bacterial growth and oxygen depletion.
littoral zone
Shore zone between high tide mark and low tide mark; also shallow water of a lake where light penetrates to the bottom.
Process by which nitrogen in ammonia and organic compounds is oxidized to nitrites and nitrates by soil bacteria.
nitrogen fixation
Process whereby free atmospheric nitrogen is converted into compounds, such as ammonium and nitrates, usually by bacteria.
pelagic division
Open portion of the sea.
photochemical smog
Air pollution that contains nitrogen oxides and hydrocarbons which react to produce ozone and PAN.
Part of plankton containing organisms that photosynthesize releasing oxygen to the atmosphere and serving as food producers in aquatic ecosystems.
fall overturn
Mixing process that occurs in fall in stratified lakes whereby the oxygenrich top waters mix with nutrient rich bottom waters
greenhouse effect
Reradiation of solar heat toward the earth, caused by gases such as carbon dioxide, methane, water vapor, ozone, and nitrous oxide in the atmosphere.
global warming
Predicted to increase the earth's temperature due to human activities that promote the greenhouse effect.
spring overturn
Mixing process that occurs in spring in stratified lakes whereby the oxygen-rich top waters mix with nutrient-rich bottom waters
thermal inversion
Temperatrue inversion that traps cold air and its pollutants near the earth with the warm air above it.
Upward movement of deep, nutrient-rich water along coasts; it replaces surface waters that move away from shore when the direction of prevailing wind shifts.
Part of plankton containing protozoa and other types of microscopic animals.