Which of the following factors determine whether a volcanic eruption will be explosive or non-explosive?
A. magma viscosity and gas content
B. gas content and rock fractures
C. magma viscosity and elevation
D. depth of magma and elevation
E. depth of magma and rock fractures
Answer: A
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The dead zone in the Gulf of Mexico is primarily the result of
A) nonpoint sources of pollutants. B) point sources of pollutants. C) a natural cycle related to cold ocean currents. D) industrial pollution by oil refineries in the New Orleans region.
Consider the plants, animals, and other organisms present in a natural area near you, and then do the following: (a) Imagine how the area may have undergone ecological succession, and (b) analyze the population-balancing mechanisms that are operating
among the various organisms. Choose one species, and predict what will happen to it if two or three other native species are removed from the area. Then predict what will happen to your chosen species if two or three foreign species are introduced into the area.
When was it discovered that storms move from place to place?
A) 1600s B) 1700s C) 1800s D) 1900s
How much of the world's table salt is produced by the evaporation of seawater?
a. one-quarter b. one-third c. one-half d. two-thirds
e. three-quarters