Naturally occurring concentrations of some toxic elements, such as arsenic, may exceed both recommended "safe" levels and wastewater standards for industry.
Answer the following statement true (T) or false (F)
True
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Which industry releases the most toxic substances into the environment?
A. metal mining B. oil and gas C. chemical D. farming
Scientists can disprove things but they cannot prove anything absolutely, which means there is always some uncertainty in science.
Answer the following statement true (T) or false (F)
In 1962, Rachel Carson published Silent Spring, which dramatized the potential dangers of ________ to food, wildlife, and humans and eventually led to changes in the United States on their use.
Fill in the blank(s) with the appropriate word(s).
Ozone thinning is
A. greatest in the Northern Hemisphere in October. B. evenly distributed for most of the year. C. greatest in the Southern Hemisphere in April. D. more pronounced in Antarctica than the Arctic.