Calculate the percent increase in CO2 between 1960 (at 320 ppm) and 2010 (at 400 ppm). The best answer is
A. 20%.
B. 400%.
C. 25%.
D. 80%.
Answer: C
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Which of the following is not evidence of recent activity at a volcano?
A) Thick, well-developed soil B) Layer of ash blanketing hillslopes C) Unweathered lava flows D) Ash flows lacking a well-developed soil
Collectively, the San Andreas fault system of California is a(n) ________.
A. reverse fault B. oblique fault C. right lateral strike-slip fault D. normal fault E. left lateral strike-slip fault
In San Francisco, earthquake hazard is increased for bridges and highways because ____
a. ?they use poured concrete without reinforcing bars b. ?their support columns are not sheathed in steel c. ?many are built on soft mud and clays d. ?the supports are anchored to bedrock e. ?the weight of vehicles increases the load on the structure
What term describes the bending of waves?
A) Reflection B) Oscillation C) Refraction D) Frequency