Refer to the scenario above. How does this gradient compare to the average geothermal gradient?
Scenario: In the pursuit of scientific knowledge, you decide to bore a hole into the crust to see how the temperature changes. You start your borehole in Davenport, Iowa, where the geothermal gradient is 20°C/km.
What will be an ideal response?
Answer: It is slightly lower than the average gradient.
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Colony collapse disorder
A) affects ant colonies, leaving most of the workers dead in the hive. B) has been traced to poisoning by organophosphate pesticides. C) is thought to be caused by a combination of pesticides, pathogens, hive pests or other synergistic toxic chemicals affecting honey bees. D) is not a threat to U.S. crops because other unaffected pollinators will replace ants and bees.
According to the graph's data for lead and MTBE use, from 1970 to 2000 lead emissions ________ and MTBE consumption _________.
a. declined nearly 100%; increased nearly 100% b. declined nearly 50%; increased nearly 100% c. declined nearly 100%; increased nearly 200% d. declined nearly 200%; increased nearly 200%
The safety factor of a slope is:
a. the ratio of the shear stress to shear strength b. the ratio of the normal stress to the tangential stress c. the ratio of the driving forces to the resisting forces d. the ratio of the resisting forces to the driving forces
Point bars are sandbars deposited in the middle of river channels.
Answer the following statement true (T) or false (F)