The geothermal gradient is, on the average, about
A. 1°C/km
B. 50°C/km
C. 30°C/km
D. 10°C/km
Answer: C
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Which type of glacial deposit was formed by running water?
A)eskers B)drumlins C)roche moutonées D)varves E)erratics
From the list provided below, choose those observations that accurately describe the mineral presented in this image. 
A. This mineral has a metallic luster. B. This mineral does not have cleavage. C. This mineral flakes into thin sheets. D. This mineral effervesces with dilute HCl. E. None of these choices are correct.
A landfill that was abandoned about 20 years ago has been eroding. Trees and grasses that had grown on the surface have died, the soil is eroding away, and buried wastes are now exposed at the surfaces
Nobody has been doing anything with the landfill for years. Most likely, these problems are the result of A) rodents trying to dig up the buried wastes. B) biogas seeping to the surface. C) settling of the Earth as the buried wastes decompose. D) leachate generation from the buried wastes.
Using a diagram, show why an inferior mirage produces an inverted image.
What will be an ideal response?