What are the most valuable marine resources?
a. mineral deposits
b. sand and gravel
c. petroleum and natural gas
d. salts
e. magnesium compounds
c
Environmental & Atmospheric Sciences
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In sub-Saharan African countries hit hard by HIV/AIDS, ________ have dropped most sharply
A) crude death rates B) crude birth rates C) life expectancies D) migration rates E) dependency ratios
Environmental & Atmospheric Sciences
Steam fogs and frontal fogs are both types of ________ fogs
Fill in the blank(s) with correct word
Environmental & Atmospheric Sciences
The combined influence of CFCs, methane and nitrous oxide as greenhouse gases is insignificant
Indicate whether the statement is true or false
Environmental & Atmospheric Sciences
Soil air supplies plants and microorganisms with what gases needed for life processes?
a. nitrogen and helium b. oxygen and methane c. carbon dioxide and oxygen d. nitrogen and carbon dioxide
Environmental & Atmospheric Sciences