Tropical cyclones form in which conditions?
a. At the boundary between circulation cells
b. Within a single great mass of warm, humid, rotating air
c. At the boundary between air masses of different density
d. At the boundary between a polar cell and its Ferrel cell
e. At the intersection of two frontal boundaries
b
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Which of the following best represents potential energy?
A) Cars stopped at an intersection B) Sunlight shining on people on a beach C) A charged battery in a flashlight D) A breeze blowing across the top of a lake
Why does a satellite in elliptical orbit gain speed as it moves closer to Earth?
A. It increases in kinetic energy. B. It moves along the direction of Earth's gravitational force. C. It's sum of kinetic and potential energies is a constant. D. all of the above
The forests in the Upper Peninsula of Michigan from which your text book was made are ________
A) suffer from erosion and heavy pesticide use B) have no mature trees C) harvested using ecosystem-based management D) harvested by clear-cutting E) plantation forests of pine and spruce
According to the fossil record on Earth, the earliest-known life-forms were primitive ________
A) bacteria B) plants C) shells D) reptiles