Classification Monera barrier islands
Long, thin, low offshore islands of sediment that generally run parallel to the shore along some coasts.
Subject:
Environmental Science
Forum reference:
Book page:
http://course-notes.org/Environmental_Science
Bacteria Prokaryotic
one-celled organisms. Some transmit diseases. Most act as decomposers and get the nutrients they need by breaking down complex organic compounds in the tissues of living or dead organisms into simpler inorganic nutrient compounds.
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background extinction
Normal extinction of various species as a result of changes in local environmental conditions. Also used natural rate of extinction. Compare mass depletion, mass extinction.
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atomic number
Number of protons in the nucleus of an atom. Compare mass number.
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Atom
Minute unit made of subatomic particles that is the basic building block of all chemical elements and thus all matter; the smallest unit of an element that can exist and still have the unique characteristics of that element. Compare ion, molecule.
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atmosphere
Whole mass of air surrounding the earth. See stratosphere, troposphere.
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asexual reproduction
Reproduction in which a mother cell divides to produce two identical daughter cells that are clones of the mother cell. This type of reproduction is common in single-celled organisms. Compare sexual reproduction.
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artificial selection
Process by which humans select one or more desirable genetic traits in the population of a plant or animal and then use selective breeding to end up with populations of the species containing large numbers of individuals with the desired traits. Compare genetic engineering, natural selection.
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arid Dry
A desert or other area with an arid climate that has little precipitation.
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area strip mining
Type of surface mining used where the terrain is flat. An earthmover strips away the overburden, and a power shovel digs a cut to remove the mineral deposit. After removal of the mineral, the trench is filled with overburden, and a new cut is made parallel to the previous one. The process is repeated over the entire site. Compare dredging, mountaintop removal, open-pit mining, subsurface mining.
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Pages
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