In terms of distance, the thickest internal structural layer of Earth is the:
a. inner core.
b. asthenosphere.
c. mantle.
d. crust.
e. outer core.
C
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As oceans become more acidic, the shells of tiny sea snails tend to dissolve. This is a concern because:
a. The snail shells provide material for jewelry making on south sea islands. b. The shells are ground up and used for fertilizer for agricultural crops. c. The snails are the base of a food web that supports entire polar ecosystems. d. More than one of these are correct. e. None of these answers.
The number of males per 100 females in the population is called
A) dependency ratio. B) maternal mortality rate. C) sex ratio. D) male fertility rate. E) the golden ratio.
Redistribution of land from the wealthy few to the masses is called ________ ________
Fill in the blank(s) with correct word
Although Colombia is one of the top three oil and petroleum providers in Latin America, its involvement in the drug trade makes securing the oil problematic for the United States
a. True b. False Indicate whether the statement is true or false