What is the second most valuable marine resource?
a. Gravel
b. Oil
c. Gas
d. Salt
ANS: A
Sand and gravel are very important marine resources. They are the second highest in monetary value.
More than 1 billion metric tons of sand and gravel was excavated in 1998. Information can be found in
the section Physical Resources
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____________________ is the contamination of the environment by a chemical or other agent such as noise or heat to a level that is harmful to the health, survival or activities of humans of other organisms
Fill in the blanks with correct word
Oral rehydration therapy
a. is less successful than expected b. is too expensive to be practical c. was a factor in saving about 3 million lives in 2008 d. can help prevent death by dehydration of a child with severe diarrhea e. None of the above
A major source of VOCs is
A. Combustion of sulphur-containing fuel B. CO in the atmosphere C. Photochemical oxidation D. Incomplete burning of hydrocarbons E. CO2 in the atmosphere
Growing rice results in the release of ______ into the atmosphere.
Fill in the blank(s) with the appropriate word(s).