Which of the following would be put at risk by the Keystone XL pipeline?
A) Lake Michigan
B) the Ogallala Aquifer
C) Yellowstone National Park
D) the American bison
E) the Nebraska Sandhills
Answer: B) the Ogallala Aquifer
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Time units are rock units that were deposited during a certain time interval
a. True b. False
The 1985 Mexico City earthquake was caused by eastward subduction of a small plate, the Cocos Plate, beneath the North American Plate.
Answer the following statement true (T) or false (F)
If one were to map a vertical profile of groundwater resources, which of the following is CORRECT order from top to bottom?
A) Zone of aeration—zone of saturation—water table—impermeable rock B) Zone of aeration—water table—zone of saturation—impermeable rock C) Water table—zone of aeration—zone of saturation—impermeable rock D) Zone of saturation—water table—zone of aeration—impermeable rock
Practices such as no-till agriculture may help mitigate against soil erosion
Indicate whether the statement is true or false