On average, what is the time interval that a great earthquake triggers a horrific calamity?
a. Roughly one hundred years
b. Every 50 years
c. Every 5 to 20 years
d. Once a year
Ans: c. Every 5 to 20 years
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Which type of drainage pattern is shown in Figure 24.4? Briefly describe the structural conditions that have created this pattern.
Figure 24.4
How has the Smokey the Bear campaign, which attempted to eliminate wildfires from forested areas altogether, damaged forest health? What is the importance of fire in ecosystem management? What is the cost of fire suppression for ecosystem health?
What is the alternative to fire suppression?
All phytoplankton are capable of photosynthesis.
Answer the following statement true (T) or false (F)
Why is radon gas of concern?
A. It is causing global warming. B. It is causing depletion of the ozone layer. C. It is a sign of an impending volcanic catastrophe. D. It causes cancer in humans.