Which of the following waves belong to shockwaves?
a. Primary (P)-waves
b. Secondary (S)-waves
c. Surface (R)-waves
d. Surface (L)-waves
e. All of the above
Answer: e. All of the above
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Why do most caves form in limestone rock formations?
A) Limestone is a soft rock. B) Limestone dissolves in rainwater. C) Limestone is the most common kind of rock on Earth. D) Limestone chemically reacts readily with acidified groundwater.
What is used to sub-divide the Phanerozoic into 3 eras?
A. It is divided based on numerical time calculations. B. It is divided by mass extinction events. C. It is divided into equal intervals.
Which naturally emitted gas, accumulating in indoor spaces, has been linked with lung cancer in humans?
A) mercury B) ozone C) asbestos D) carbon monoxide E) radon
What changes have increased the risk associated with the Santa Ana winds in southern California?
A) There hasn't been an increased risk — people have started building outside of fire zones now. B) Commonly used landscape trees are more flammable than naturally occurring vegetation. C) Climate change has increased the local rainfall, leading to mudslides. D) Very little flammable material exists anymore in the landscape, so houses burn more easily.