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Runk's Science 1

chapter 21

Pollution the presence of substances in the environment that are harmful to plants, animals, and humans
hazardous waste trash that is harmful to humans and the environment
Where does hazardous waste come from? industries (paper mills, nuclear power plants, oil refineries), hostipals and laboratories, homes (old cars, paint, batteries)
How do chemicals harm the environment? pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic
toxic poisonous
radioactive wastes takes hundreds or thousands of years to become harmless; cause cancer, lukemia, and defects
greenhouse effect carbon dioxide and pollutants act like a greenhouse around the earth; temps rise and polar ice caps melt
Why is noise considered pollution? loud noise affects the ability to hear and think
renewable resource a resource that can be used over and over again or that is unlimited in supply
nonrnewable resource a resource that can only be used once; ex: oil
alien species an organism that is carried to a new place by humans and thrives; can become a pest and drive out native species; ex: zebra mussel, purple loosestrife
overpopulation when the number of individuals becomes so large that they cannot get the food, water, and resource they need on an ongoing basis
biodiversity variety of life or the many different species found in a particular habitat
deforestation clearing of forest lands for lumber, nuts, rubber, paper,....
How do chemicals harm the environment? pesticides pollute soil and water; CFC's destroy the ozone layer; PCB's are toxic
How are wetlands important? help control flooding, filter pollution, and provide breeding grounds; often drained for farmland, homes, shopping malls,...
What are 2 reasons for marine habtat loss? Oil and plastics
biodegradable things that are broken down by the environment
why do alien species thrive? because they usually have no predators in the new environment
conservation the wise use of and preservation of natural resources
The 3 R's of conservation Reduce, Reuse, Recycle
What are ways to reduce pollution and waste? *products are wrapped in less plastic and paper *choose to not take your purchases in a paper or plastic sack *creating biodegradable plastics *not using chemicals in farming *alternative sources of energy like wind and solar
What are ways to reuse resources? reuse water for lawns and plants *reusing items like clothing and rechargeable batteries
What are ways we can recycle? *plastics, glass, aluminum, wood and cardboard can be recycled to make new products *waste can be burned to make electricity
resource recovery the process of transforming garbage into electricity
Why is biodiversity important? *if a disease affects one type of tree, it won't wipe out the whole forest *each species makes an important contribution
How can we maintain biodiversity? *protect individual species *protect habitats
Endangered Species Act *law forbids activities that might endanger a species on the list *requires development of programs to help endangered populations recover
Created by: weavergina