Partially compacted snow that is an intermediate between snow and ice is called a(n)
A) firn.
B) glacier.
C) moraine.
D) snowline.
A
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The three-cell model of atmospheric circulation:
A) gives a good approximation of what actually happens over the entire Difficulty: Globe. B) is not significantly better than the Hadley model. C) does not address what happens at the poles. D) is better at explaining the ITCZ than at explaining the frequency of easterlies in subpolar latitudes.
Undersea earthquakes and volcanic eruptions may produce ________
A) pyroclastic flow B) hurricanes C) lahars D) tsunamis E) mass wasting
The elevations of continents and oceans vary from each other because
A) oceanic crust is thinner and denser than continental crust. B) oceanic crust is thinner and less dense than continental crust. C) oceanic crust is thicker and denser than continental crust. D) oceanic crust is thicker and less dense than continental crust.
Ecological tipping points related to the earth's major natural systems are also called ____.
A. natural limits B. extinction forces C. ecological delimiters D. planetary boundaries E. biosphere requirements