soil contamination

Question 1

what is contamination

Answer 1

the abnormal presence of harmful substances in the environment

Question 2

what are 3 soil contaminators

Answer 2

-fertilizers: get into water system and cause growth of blue-green algae
-pesticides: kills micro organisms that break down soil
-heavy metals (car exhaust, gasoline, SO2 and NOx causes acid rain then acidic soil): upsets the nature balance of pH and nutrients, can kill micro organisms and cause plants to grow slowly