Why is the West Wind Drift not considered a gyre?
a. It is too large to be a gyre.
b. It is a closed circuit current.
c. It is driven by westerly winds.
d. It does not flow around the margins of an ocean basin.
ANS: D
The West Wind Drift, also called the Antarctic Circumpolar Current, is the largest current. It is not
deflected by any continents. Information can be found in the section Surface Currents Are Driven by
the Winds.
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According to most estimates, Earth is approximately
A) 4.6 thousand years old. B) 4.6 million years old. C) 4.6 billion years old. D) 4.6 trillion years old.
Mutualism is ________
A) a relationship between two species in which only one benefits B) a relationship between a beneficial predator and its prey C) a relationship with no benefits to either species D) a relationship between two species in which both benefit E) a relationship in which two species have a mutual predator
_______ are underwater volcanic mountains
Fill in the blank(s) with correct word
You have decided on a career as an ecologist. Your work could possibly be which of the following assignments?
a. exploring the earth's crust to locate mineral resources b. negotiating air quality agreements among different countries c. studying interactions of wolves and their prey species in Yellowstone National Park d. studying depletion of large aquifers in the midwestern United States e. exploring possible wind corridors in the intermountain west for placement of wind farms