Which of these species is least vulnerable to extinction?
a. A species with a population size of 50 individuals
b. A species distributed throughout the United States
c. A species that eats only river snails
d. A species that lives on mountaintops
Answer: B
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What is the lowest point to which a stream can flow?
A. Base level B. Headwaters C. Gradient
A supplier wants to make a profit by buying metal by weight at one altitude and selling it at the same price per pound at another altitude. The supplier should
A) buy at a high altitude and sell at a low altitude. B) buy at a low altitude and sell at a high altitude. C) disregard altitude because it makes no difference.
The most notable trace in the geologic record of human activities is likely to be a(n) ____
a. more diverse pollen record b. concrete and metal debris field left from cities c. expansion of farmland d. increase in carbon dioxide levels, as recorded by ice cores e. more alkaline ocean
Elastic deformation means that, before exceeding the elastic limit, rock can:
a. flow b. fracture c. only slightly change its size and/or shape because the stress is not large enough to make any further deformation d. return to its original size and shape when the stress is removed e. Both c and d