The United Nations projects that by 2030 the urban population will make up over ________ of the total Earth's population.

A. 20 percent
B. 60 percent
C. 40 percent
D. None of these are correct


Answer: B

Environmental & Atmospheric Sciences

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In Belgium, language boundary sharply divides the country into two regions: Southern Belgians speak French and northern Belgians speak Flemish

Indicate whether the statement is true or false.

Environmental & Atmospheric Sciences

Another word for cover crops isĀ 

A. Mulch B. Shade planting C. Green manure D. Strip farming E. All of these are correct

Environmental & Atmospheric Sciences

The average Earth density is ________ the mantle density

A) unrelated to B) equal to C) less than D) greater than

Environmental & Atmospheric Sciences

Fossil evidence suggests that such land-dwelling arthropods as _____ had evolved by at least the Devonian

A)trilobites B)molluscs C)scorpions D)beetles E)spiders

Environmental & Atmospheric Sciences