Smelting of iron ore involves ________
A) dissolving the ore in hot water to separate iron and aluminum
B) washing the ore with acid to extract iron
C) crushing and heating the ore at its melting point
D) heating beyond iron's melting point and combining the material with carbon
E) oxidizing iron to ferric oxide and then adding silicon and boron
D
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Family planning means enabling people to
A. Have many children B. Decide in advance how many children they should have C. Have no children D. Have fewer children so that the population growth rate can reach ZPG E. Have more children if they live in a country with a birth dearth
____________________ refers to the long-term average of weather patterns in a particular area.
Fill in the blank(s) with the appropriate word(s).
Which countries are at the highest risk for major earthquakes?
a. those along the east coast of South America? b. ?those near the Arctic Circle c. ?those in southern Europe d. ?those along the east coast of North America e. ?those in the sub-African interior
The controlled breeding of plants and animals, called _______________, dramatically gave humans the power to modify landscapes
Fill in the blank(s) with correct word