Science 4-6 Crossword
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
                                       
 
 
Down: 1) breakdowsn slowly or not at all. eg- pesticides, petroleum products, heavy metal3) any material or form that causes harm to a living organism.4) not all individuals react the same way to a chemical, establishing risk is often difficult.5) is the ability of a chemical to cause a harm to an organsim7) any alteration of the environment producing harmful conditions Across: 2) lower the oxygen level which kills aquatic animals.6) serious symptons occur after one exposure8) broken down by natural means like a chemical reaction. eg- fertillizers or sewage.9) lethal dose so which means to the dose of a chemical that will kill 50 percent of the population.10) symptons occur after a chemical accumulates to a level over time11) 
 

 

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