Where do we find potholes, and how do they form? Why do they pose a hazard to humans?
What will be an ideal response?
ANSWER: Potholes are found in steep, rock-bound stream canyons where turbulent flow swirls rocks in whirlpools. Larger rocks caught in such turbulent eddies carve away at the bedrock, gradually drilling a cylindrical hole. Many people swim in potholes, but this is dangerous because of extreme turbulence and vortexes that render flotation devices ineffective.?
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What kind of drainage pattern has developed around the outside of the Okmok Caldera?
The question is based on Map T-2, the “Umnak, Alaska” topographic map (scale 1:250,000; contour interval 200 feet). What will be an ideal response?
The main direction in which groundwater flowed in the Investigation area was to the
A) north. B) east. C) south. D) west.
The world's population of urban settlements exceeded that of rural settlements for the first time in ________
A) 1990 B) 1995 C) 2000 D) 2001 E) 2008
Sea breezes reach their maximum on shore wind speeds ________.
A. during the hottest part of the day B. shortly after sunset C. shortly after sunrise D. at random times during a 24-hour period