What is the approximate age of Earth?
A)10,000 years
B)12.6 million years
C)3.2 million years
D)4.6 billion years
E)13.5 billion years
D
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Most often, tornadoes form with supercell thunderstorms in an environment with strong ____
a. radiational cooling b. precipitation c. vertical wind shear d. horizontal wind shear e. suction vortices
The technology called ____ involves removing CO2 from the smokestacks of coal-burning and industrial power plants in order to isolate it from the environment.
A. synfuel B. coal gasification C. coal capture and sequestration D. hydrofracking E. refining
Predict the demographic future of Central Asia and Afghanistan
What will be an ideal response?
The Sahel
A) is just north of the Sahara Desert. B) was under the control of the Soviet Union. C) has precipitation that is under the influence of the ITCZ. D) increased in size substantially in the 1980s. E) all of the above