The Appalachian Mountains were formed when the North American continent collided with Africa to form the supercontinent Pangaea over 250 million years ago. What kind of tectonic boundary existed here?
What sort of structural features would you expect to find in this region?
What will be an ideal response?
Answer: Since this is a convergent boundary, expected features would include folds such as anticlines and synclines as well as reverse or thrust faults.
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The overall regional life expectancy in sub-Saharan Africa is
A) 83 years B) 57 years C) 47 years D) 77 years E) 67 years
Tsunami arrive as a series of several waves separated by periods typically in the ________ range.
A. 1- to 6-hour B. 1- to 6-second C. 1- to 6-minute D. 10- to 60-minute E. 10- to 60-second
The updrafts in thunderstorms are initiated by thermal instabilities at the surface. What process tends to increase the vertical instability that feeds the thunderstorm development?
A) Coriolis forces B) a jet stream aloft C) release of latent heat by condensation D) low pressure aloft
As the South Atlantic basin widens by seafloor spreading, Africa and South America are moving closer together
Indicate whether the statement is true or false