In the three-cell model of Earth's general air circulation, areas of surface low pressure should be found at ____
A) the equator and the poles
B) the equator and 30° latitude
C) the equator and 60° latitude
D) 30° latitude and 60° latitude
C
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A farmer decides he will wait until the number of crop-eating insects gets large enough to create economic damage before he takes action. When that occurs, he will first try natural biological controls. If that does not work, he will use less harmful biopesticides in small amounts to target specific species; and then only use synthetic chemicals if he has no other choice. What is this approach called?
A. Integrated pest management B. Conventional pest management C. Polyculture management D. Biodiversity management system
The trajectory of a projectile that accelerates in only the vertical direction while moving at a constant horizontal velocity is called a
A. parabola. B. circle. C. both of these D. none of the above
What is the calcium carbonate compensation depth? Briefly explain why calcareous oozes are not found below this depth
A cooling of surface ocean waters in the eastern equatorial Pacific Ocean is known specifically as ________
A) the Little Ice Age B) La Niña C) the ENSO effect D) Antarctic bottom water E) El Niño