Deep ocean currents often move cold, dense water away from the poles.
a. true
b. false
Answer: a. true
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The Hadley Cell was originally envisaged to cover most, if not all of each hemisphere, North and South. What area does it actually cover?
A) Just areas near the equator B) Just the Tropics C) Just the Mid-latitudes D) Just the Tropics and the Mid-Latitudes
Which two gases are primarily responsible for the greenhouse effect because of their ability to absorb infrared energy?
A) oxygen and hydrogen B) ozone and dust C) nitrogen and oxygen D) water vapor and carbon dioxide
Biological nitrogen fixation (nitrogen fixation that is performed by living organisms) is carried out by ________
A) pine trees B) slime molds C) mammals D) fungi E) various species of specialized bacteria
A fathom is a unit of ________.
A. weight B. speed C. depth D. distance E. time