Unlike mass wasting, gradual subsidence and sudden collapse involve the movement of earth materials without any slope. Sudden collapse is typically caused by which of the following?
A. collapse of caves in limestone rock
B. collapse of underground aquifers
C. repeated eruptions of volcanic ash
D. repeated eruption of steam geysers
E. all of the answers listed here
Answer: A
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Despite a massive reduction in the poverty rate, upwards of how many Chinese still live on less than $1.25 a day?
A) 200,000 B) 200 million C) 2 billion D) 2 million E) 20 million
Evolution occurs as a result of
A. A population's physiological modification B. The discovery of a desirable characteristic in a population C. An environmental change that forces modification in a resident species D. An individual's physiological modification E. Better survival or reproduction rates by individuals with a particular characteristic
In cultural eutrophication, game fish die from
A. acid deposition. B. suffocation from lack of oxygen. C. toxic substances in the water. D. salinization. E. habitat loss.
The average thickness of the Earth's crust is about ________ miles
A) 70 B) 55 C) 34 D) 28 E) 17