Highly toxic preparations made of ashes, sulfur, arsenic compunds, ground tabacco, or hydrogen cyanide.
Zinic, lead and mercury compunds were also use
An organochlorine insecticde used first to control malaria-carrying mosquitos and lice and later controlled a variety of insect pest but banned in USA bc of persistence in envior. and ability to bioaccumulate
organic compound in secticidal properties.
Second Gerneration pesicides
DDT became the 1st & 2nd generation pesticide.
Replace pesticides that contained harmful chem.
Chem subtance that kill insects,weeds and a whole assortment of organisms that reduce crop output.
Discarded solid, liquid or gaseous material that may pose substantial threat/ potential hazard to humans health or envoir. when improperly handled.
Surface Advantages and disadvantages:
only 10% of enviorn. is distrubed
Alot of mineral is left behind(cave in's, explosion)
Harmful 2 workers bc of exposed elements, dust expensive
counts as majority of diff mineral elements that r extracted from usa.
Utilize heavy equipmetn with usage of fossil fuel scares large area of surface
revegatate and close hole doesnt appy to LCD air pollution and water pollution.
Estimation of Risk
Determines the propability of an event or occurqnce "how likey of event/occrance"
Determine severity of an event,answering question "how much damage could be caused"
Help ppl understand & quantify risks posed by technology, our lifestyles & other personal habits( smoking)
involves stpes to identify potential and real dangers.Estimation of risk:1.determines the porbability of an event or accurance "how likely
Large dose to determine toxicity
High-does studies reduce # od lab animals beeded and can cut time/cost
Theshold level large doses
Thereshold= level below which no effect occurs.
Researchers use high does to speed up expierments.
General Rule= entire process from exposure to manifestation takes about 1/8 th of life span of an animal.