Which of the following hazards is not commonly associated with volcanic eruptions?
A. poisonous or otherwise deadly gases
B. lava flows
C. pyroclastic flows
D. lahars
E. All of these choices are correct.
Answer: E
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Estuaries and their productive saltmarsh habitats serve as nurseries for many species. Being a nursery means that
1.this is where most marine animals are born.
2.animals can live there during both high and low tides.
3.larvae and juveniles of marine species find shelter, feed, and grow rapidly there.
4.this is where infant mortality rate is lowest.
Isotopes of the same element ____
A)cause the same element to cleave differently B)drastically change the element's chemical properties C)have different numbers of neutrons but the same number of protons D)often combine to form ions E)must be negatively charged
The most common nutrient that limits coastal productivity is ________.
A. oxygen B. iron C. nitrate D. carbon E. phosphate
Rowland and Molina's work showed that ultraviolet light in the stratosphere causes CFCs to release ________ atoms
A) chlorine B) hydrogen C) fluoride D) carbon E) mercury