The three intervals, from oldest to youngest, of Precambrian time are the ____
a. Hadean Eon, Archean Eon, and Proterozoic Eon
b. Archean Era, Hadean Era, and Proterozoic Era
c. Proterozoic Eon, Hadean Eon, and Archean Eon
d. Hadean Era, Archean Era, and Proterozoic Era
e. Archean Eon, Hadean Eon, and Proterozoic Eon
a
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Industrial agriculture ________
A) increased our ability to obtain more food from the same area B) had no impact on agriculture C) permanently improved soils, providing more food from less space D) rapidly deteriorated soils, requiring continuous movement to new croplands E) is necessary today for all cultures
What property of alloys make them ideal for developing new materials?
A. The size of the atoms involved is directly related to the electrical conductivity. B. Alloys are very rigid and are extremely resistant to chemical decomposition. C. The characteristics of the material change depending on how much of each component is present. D. all of the above E. none of the above
Which one of the following is not true of glaciers?
A) originate on land B) exist only in the Northern Hemisphere C) form from the recrystallization of snow D) show evidence of past or present flow
According to the three-cell general circulation model, surface winds are ____________ directly north of the equator and _______________ directly south of the equator.
a. northwesterly; southeasterly b. northeasterly; southeasterly c. northwesterly; southwesterly d. northeasterly; southwesterly